![Swen Schillig](/assets/img/avatar_default.png)
A scheduled work might still be pending, running while the adapter is in progress to get dequeued from the system. This can lead to an invalid pointer dereference (Oops). Once the adpater is set online again, ensure the nameserver environment is initialized to the appropriate values again. Signed-off-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
722 lines
19 KiB
C
722 lines
19 KiB
C
/*
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* zfcp device driver
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*
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* Module interface and handling of zfcp data structures.
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*
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* Copyright IBM Corporation 2002, 2009
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*/
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/*
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* Driver authors:
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* Martin Peschke (originator of the driver)
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* Raimund Schroeder
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* Aron Zeh
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* Wolfgang Taphorn
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* Stefan Bader
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* Heiko Carstens (kernel 2.6 port of the driver)
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* Andreas Herrmann
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* Maxim Shchetynin
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* Volker Sameske
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* Ralph Wuerthner
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* Michael Loehr
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* Swen Schillig
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* Christof Schmitt
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* Martin Petermann
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* Sven Schuetz
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*/
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#define KMSG_COMPONENT "zfcp"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/miscdevice.h>
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#include <linux/seq_file.h>
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#include "zfcp_ext.h"
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#define ZFCP_BUS_ID_SIZE 20
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MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
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MODULE_DESCRIPTION("FCP HBA driver");
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MODULE_LICENSE("GPL");
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static char *init_device;
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module_param_named(device, init_device, charp, 0400);
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MODULE_PARM_DESC(device, "specify initial device");
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static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter)
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{
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int idx;
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adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
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GFP_KERNEL);
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if (!adapter->req_list)
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return -ENOMEM;
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for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
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INIT_LIST_HEAD(&adapter->req_list[idx]);
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return 0;
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}
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/**
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* zfcp_reqlist_isempty - is the request list empty
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* @adapter: pointer to struct zfcp_adapter
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*
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* Returns: true if list is empty, false otherwise
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*/
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int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
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{
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unsigned int idx;
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for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
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if (!list_empty(&adapter->req_list[idx]))
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return 0;
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return 1;
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}
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static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun)
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{
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struct zfcp_adapter *adapter;
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struct zfcp_port *port;
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struct zfcp_unit *unit;
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down(&zfcp_data.config_sema);
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read_lock_irq(&zfcp_data.config_lock);
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adapter = zfcp_get_adapter_by_busid(busid);
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if (adapter)
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zfcp_adapter_get(adapter);
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read_unlock_irq(&zfcp_data.config_lock);
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if (!adapter)
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goto out_adapter;
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port = zfcp_port_enqueue(adapter, wwpn, 0, 0);
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if (IS_ERR(port))
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goto out_port;
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unit = zfcp_unit_enqueue(port, lun);
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if (IS_ERR(unit))
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goto out_unit;
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up(&zfcp_data.config_sema);
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ccw_device_set_online(adapter->ccw_device);
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zfcp_erp_wait(adapter);
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wait_event(adapter->erp_done_wqh,
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!(atomic_read(&unit->status) &
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ZFCP_STATUS_UNIT_SCSI_WORK_PENDING));
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down(&zfcp_data.config_sema);
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zfcp_unit_put(unit);
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out_unit:
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zfcp_port_put(port);
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out_port:
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zfcp_adapter_put(adapter);
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out_adapter:
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up(&zfcp_data.config_sema);
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return;
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}
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static struct kmem_cache *zfcp_cache_create(int size, char *name)
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{
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int align = 1;
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while ((size - align) > 0)
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align <<= 1;
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return kmem_cache_create(name , size, align, 0, NULL);
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}
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static void __init zfcp_init_device_setup(char *devstr)
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{
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char *token;
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char *str;
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char busid[ZFCP_BUS_ID_SIZE];
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u64 wwpn, lun;
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/* duplicate devstr and keep the original for sysfs presentation*/
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str = kmalloc(strlen(devstr) + 1, GFP_KERNEL);
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if (!str)
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return;
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strcpy(str, devstr);
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token = strsep(&str, ",");
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if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE)
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goto err_out;
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strncpy(busid, token, ZFCP_BUS_ID_SIZE);
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token = strsep(&str, ",");
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if (!token || strict_strtoull(token, 0, (unsigned long long *) &wwpn))
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goto err_out;
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token = strsep(&str, ",");
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if (!token || strict_strtoull(token, 0, (unsigned long long *) &lun))
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goto err_out;
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kfree(str);
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zfcp_init_device_configure(busid, wwpn, lun);
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return;
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err_out:
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kfree(str);
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pr_err("%s is not a valid SCSI device\n", devstr);
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}
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static int __init zfcp_module_init(void)
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{
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int retval = -ENOMEM;
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zfcp_data.fsf_req_qtcb_cache = zfcp_cache_create(
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sizeof(struct zfcp_fsf_req_qtcb), "zfcp_fsf");
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if (!zfcp_data.fsf_req_qtcb_cache)
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goto out;
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zfcp_data.sr_buffer_cache = zfcp_cache_create(
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sizeof(struct fsf_status_read_buffer), "zfcp_sr");
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if (!zfcp_data.sr_buffer_cache)
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goto out_sr_cache;
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zfcp_data.gid_pn_cache = zfcp_cache_create(
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sizeof(struct zfcp_gid_pn_data), "zfcp_gid");
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if (!zfcp_data.gid_pn_cache)
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goto out_gid_cache;
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zfcp_data.work_queue = create_singlethread_workqueue("zfcp_wq");
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sema_init(&zfcp_data.config_sema, 1);
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rwlock_init(&zfcp_data.config_lock);
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zfcp_data.scsi_transport_template =
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fc_attach_transport(&zfcp_transport_functions);
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if (!zfcp_data.scsi_transport_template)
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goto out_transport;
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retval = misc_register(&zfcp_cfdc_misc);
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if (retval) {
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pr_err("Registering the misc device zfcp_cfdc failed\n");
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goto out_misc;
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}
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retval = zfcp_ccw_register();
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if (retval) {
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pr_err("The zfcp device driver could not register with "
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"the common I/O layer\n");
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goto out_ccw_register;
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}
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if (init_device)
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zfcp_init_device_setup(init_device);
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return 0;
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out_ccw_register:
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misc_deregister(&zfcp_cfdc_misc);
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out_misc:
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fc_release_transport(zfcp_data.scsi_transport_template);
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out_transport:
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kmem_cache_destroy(zfcp_data.gid_pn_cache);
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out_gid_cache:
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kmem_cache_destroy(zfcp_data.sr_buffer_cache);
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out_sr_cache:
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kmem_cache_destroy(zfcp_data.fsf_req_qtcb_cache);
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out:
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return retval;
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}
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module_init(zfcp_module_init);
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/**
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* zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
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* @port: pointer to port to search for unit
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* @fcp_lun: FCP LUN to search for
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*
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* Returns: pointer to zfcp_unit or NULL
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*/
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struct zfcp_unit *zfcp_get_unit_by_lun(struct zfcp_port *port, u64 fcp_lun)
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{
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struct zfcp_unit *unit;
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list_for_each_entry(unit, &port->unit_list_head, list)
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if ((unit->fcp_lun == fcp_lun) &&
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!(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_REMOVE))
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return unit;
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return NULL;
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}
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/**
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* zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
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* @adapter: pointer to adapter to search for port
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* @wwpn: wwpn to search for
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*
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* Returns: pointer to zfcp_port or NULL
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*/
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struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter,
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u64 wwpn)
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{
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struct zfcp_port *port;
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list_for_each_entry(port, &adapter->port_list_head, list)
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if ((port->wwpn == wwpn) &&
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!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_REMOVE))
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return port;
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return NULL;
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}
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static void zfcp_sysfs_unit_release(struct device *dev)
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{
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kfree(container_of(dev, struct zfcp_unit, sysfs_device));
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}
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/**
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* zfcp_unit_enqueue - enqueue unit to unit list of a port.
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* @port: pointer to port where unit is added
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* @fcp_lun: FCP LUN of unit to be enqueued
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* Returns: pointer to enqueued unit on success, ERR_PTR on error
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* Locks: config_sema must be held to serialize changes to the unit list
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*
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* Sets up some unit internal structures and creates sysfs entry.
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*/
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struct zfcp_unit *zfcp_unit_enqueue(struct zfcp_port *port, u64 fcp_lun)
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{
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struct zfcp_unit *unit;
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unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL);
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if (!unit)
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return ERR_PTR(-ENOMEM);
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atomic_set(&unit->refcount, 0);
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init_waitqueue_head(&unit->remove_wq);
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unit->port = port;
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unit->fcp_lun = fcp_lun;
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dev_set_name(&unit->sysfs_device, "0x%016llx",
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(unsigned long long) fcp_lun);
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unit->sysfs_device.parent = &port->sysfs_device;
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unit->sysfs_device.release = zfcp_sysfs_unit_release;
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dev_set_drvdata(&unit->sysfs_device, unit);
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/* mark unit unusable as long as sysfs registration is not complete */
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atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
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spin_lock_init(&unit->latencies.lock);
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unit->latencies.write.channel.min = 0xFFFFFFFF;
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unit->latencies.write.fabric.min = 0xFFFFFFFF;
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unit->latencies.read.channel.min = 0xFFFFFFFF;
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unit->latencies.read.fabric.min = 0xFFFFFFFF;
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unit->latencies.cmd.channel.min = 0xFFFFFFFF;
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unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
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read_lock_irq(&zfcp_data.config_lock);
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if (zfcp_get_unit_by_lun(port, fcp_lun)) {
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read_unlock_irq(&zfcp_data.config_lock);
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goto err_out_free;
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}
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read_unlock_irq(&zfcp_data.config_lock);
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if (device_register(&unit->sysfs_device))
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goto err_out_free;
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if (sysfs_create_group(&unit->sysfs_device.kobj,
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&zfcp_sysfs_unit_attrs)) {
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device_unregister(&unit->sysfs_device);
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return ERR_PTR(-EIO);
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}
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zfcp_unit_get(unit);
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write_lock_irq(&zfcp_data.config_lock);
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list_add_tail(&unit->list, &port->unit_list_head);
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atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
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atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
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write_unlock_irq(&zfcp_data.config_lock);
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zfcp_port_get(port);
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return unit;
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err_out_free:
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kfree(unit);
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return ERR_PTR(-EINVAL);
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}
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/**
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* zfcp_unit_dequeue - dequeue unit
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* @unit: pointer to zfcp_unit
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*
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* waits until all work is done on unit and removes it then from the unit->list
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* of the associated port.
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*/
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void zfcp_unit_dequeue(struct zfcp_unit *unit)
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{
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wait_event(unit->remove_wq, atomic_read(&unit->refcount) == 0);
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write_lock_irq(&zfcp_data.config_lock);
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list_del(&unit->list);
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write_unlock_irq(&zfcp_data.config_lock);
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zfcp_port_put(unit->port);
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sysfs_remove_group(&unit->sysfs_device.kobj, &zfcp_sysfs_unit_attrs);
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device_unregister(&unit->sysfs_device);
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}
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static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
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{
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/* must only be called with zfcp_data.config_sema taken */
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adapter->pool.fsf_req_erp =
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mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache);
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if (!adapter->pool.fsf_req_erp)
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return -ENOMEM;
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adapter->pool.fsf_req_scsi =
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mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache);
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if (!adapter->pool.fsf_req_scsi)
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return -ENOMEM;
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adapter->pool.fsf_req_abort =
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mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache);
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if (!adapter->pool.fsf_req_abort)
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return -ENOMEM;
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adapter->pool.fsf_req_status_read =
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mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
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sizeof(struct zfcp_fsf_req));
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if (!adapter->pool.fsf_req_status_read)
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return -ENOMEM;
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adapter->pool.data_status_read =
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mempool_create_slab_pool(FSF_STATUS_READS_RECOM,
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zfcp_data.sr_buffer_cache);
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if (!adapter->pool.data_status_read)
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return -ENOMEM;
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adapter->pool.data_gid_pn =
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mempool_create_slab_pool(1, zfcp_data.gid_pn_cache);
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if (!adapter->pool.data_gid_pn)
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return -ENOMEM;
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return 0;
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}
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static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
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{
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/* zfcp_data.config_sema must be held */
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if (adapter->pool.fsf_req_erp)
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mempool_destroy(adapter->pool.fsf_req_erp);
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if (adapter->pool.fsf_req_scsi)
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mempool_destroy(adapter->pool.fsf_req_scsi);
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if (adapter->pool.fsf_req_abort)
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mempool_destroy(adapter->pool.fsf_req_abort);
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if (adapter->pool.fsf_req_status_read)
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mempool_destroy(adapter->pool.fsf_req_status_read);
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if (adapter->pool.data_status_read)
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mempool_destroy(adapter->pool.data_status_read);
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if (adapter->pool.data_gid_pn)
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mempool_destroy(adapter->pool.data_gid_pn);
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}
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/**
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* zfcp_status_read_refill - refill the long running status_read_requests
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* @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
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*
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* Returns: 0 on success, 1 otherwise
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*
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* if there are 16 or more status_read requests missing an adapter_reopen
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* is triggered
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*/
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int zfcp_status_read_refill(struct zfcp_adapter *adapter)
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{
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while (atomic_read(&adapter->stat_miss) > 0)
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if (zfcp_fsf_status_read(adapter)) {
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if (atomic_read(&adapter->stat_miss) >= 16) {
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zfcp_erp_adapter_reopen(adapter, 0, "axsref1",
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NULL);
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return 1;
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}
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break;
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} else
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atomic_dec(&adapter->stat_miss);
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return 0;
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}
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static void _zfcp_status_read_scheduler(struct work_struct *work)
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{
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zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
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stat_work));
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}
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static void zfcp_print_sl(struct seq_file *m, struct service_level *sl)
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{
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struct zfcp_adapter *adapter =
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container_of(sl, struct zfcp_adapter, service_level);
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seq_printf(m, "zfcp: %s microcode level %x\n",
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dev_name(&adapter->ccw_device->dev),
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adapter->fsf_lic_version);
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}
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/**
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* zfcp_adapter_enqueue - enqueue a new adapter to the list
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* @ccw_device: pointer to the struct cc_device
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*
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* Returns: 0 if a new adapter was successfully enqueued
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* -ENOMEM if alloc failed
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* Enqueues an adapter at the end of the adapter list in the driver data.
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* All adapter internal structures are set up.
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* Proc-fs entries are also created.
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* locks: config_sema must be held to serialise changes to the adapter list
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*/
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int zfcp_adapter_enqueue(struct ccw_device *ccw_device)
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{
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struct zfcp_adapter *adapter;
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/*
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* Note: It is safe to release the list_lock, as any list changes
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* are protected by the config_sema, which must be held to get here
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*/
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adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
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if (!adapter)
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return -ENOMEM;
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ccw_device->handler = NULL;
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adapter->ccw_device = ccw_device;
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atomic_set(&adapter->refcount, 0);
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if (zfcp_qdio_allocate(adapter))
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goto qdio_allocate_failed;
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if (zfcp_allocate_low_mem_buffers(adapter))
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goto failed_low_mem_buffers;
|
|
|
|
if (zfcp_reqlist_alloc(adapter))
|
|
goto failed_low_mem_buffers;
|
|
|
|
if (zfcp_adapter_debug_register(adapter))
|
|
goto debug_register_failed;
|
|
|
|
init_waitqueue_head(&adapter->remove_wq);
|
|
init_waitqueue_head(&adapter->erp_thread_wqh);
|
|
init_waitqueue_head(&adapter->erp_done_wqh);
|
|
|
|
INIT_LIST_HEAD(&adapter->port_list_head);
|
|
INIT_LIST_HEAD(&adapter->erp_ready_head);
|
|
INIT_LIST_HEAD(&adapter->erp_running_head);
|
|
|
|
spin_lock_init(&adapter->req_list_lock);
|
|
|
|
spin_lock_init(&adapter->hba_dbf_lock);
|
|
spin_lock_init(&adapter->san_dbf_lock);
|
|
spin_lock_init(&adapter->scsi_dbf_lock);
|
|
spin_lock_init(&adapter->rec_dbf_lock);
|
|
spin_lock_init(&adapter->req_q_lock);
|
|
spin_lock_init(&adapter->qdio_stat_lock);
|
|
|
|
rwlock_init(&adapter->erp_lock);
|
|
rwlock_init(&adapter->abort_lock);
|
|
|
|
sema_init(&adapter->erp_ready_sem, 0);
|
|
|
|
INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
|
|
INIT_WORK(&adapter->scan_work, _zfcp_scan_ports_later);
|
|
|
|
adapter->service_level.seq_print = zfcp_print_sl;
|
|
|
|
/* mark adapter unusable as long as sysfs registration is not complete */
|
|
atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
|
|
|
|
dev_set_drvdata(&ccw_device->dev, adapter);
|
|
|
|
if (sysfs_create_group(&ccw_device->dev.kobj,
|
|
&zfcp_sysfs_adapter_attrs))
|
|
goto sysfs_failed;
|
|
|
|
atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
|
|
|
|
if (!zfcp_adapter_scsi_register(adapter))
|
|
return 0;
|
|
|
|
sysfs_failed:
|
|
zfcp_adapter_debug_unregister(adapter);
|
|
debug_register_failed:
|
|
dev_set_drvdata(&ccw_device->dev, NULL);
|
|
kfree(adapter->req_list);
|
|
failed_low_mem_buffers:
|
|
zfcp_free_low_mem_buffers(adapter);
|
|
qdio_allocate_failed:
|
|
zfcp_qdio_free(adapter);
|
|
kfree(adapter);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/**
|
|
* zfcp_adapter_dequeue - remove the adapter from the resource list
|
|
* @adapter: pointer to struct zfcp_adapter which should be removed
|
|
* locks: adapter list write lock is assumed to be held by caller
|
|
*/
|
|
void zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
|
|
{
|
|
int retval = 0;
|
|
unsigned long flags;
|
|
|
|
cancel_work_sync(&adapter->scan_work);
|
|
cancel_work_sync(&adapter->stat_work);
|
|
cancel_delayed_work_sync(&adapter->nsp.work);
|
|
zfcp_adapter_scsi_unregister(adapter);
|
|
sysfs_remove_group(&adapter->ccw_device->dev.kobj,
|
|
&zfcp_sysfs_adapter_attrs);
|
|
dev_set_drvdata(&adapter->ccw_device->dev, NULL);
|
|
/* sanity check: no pending FSF requests */
|
|
spin_lock_irqsave(&adapter->req_list_lock, flags);
|
|
retval = zfcp_reqlist_isempty(adapter);
|
|
spin_unlock_irqrestore(&adapter->req_list_lock, flags);
|
|
if (!retval)
|
|
return;
|
|
|
|
zfcp_adapter_debug_unregister(adapter);
|
|
zfcp_qdio_free(adapter);
|
|
zfcp_free_low_mem_buffers(adapter);
|
|
kfree(adapter->req_list);
|
|
kfree(adapter->fc_stats);
|
|
kfree(adapter->stats_reset_data);
|
|
kfree(adapter);
|
|
}
|
|
|
|
static void zfcp_sysfs_port_release(struct device *dev)
|
|
{
|
|
kfree(container_of(dev, struct zfcp_port, sysfs_device));
|
|
}
|
|
|
|
/**
|
|
* zfcp_port_enqueue - enqueue port to port list of adapter
|
|
* @adapter: adapter where remote port is added
|
|
* @wwpn: WWPN of the remote port to be enqueued
|
|
* @status: initial status for the port
|
|
* @d_id: destination id of the remote port to be enqueued
|
|
* Returns: pointer to enqueued port on success, ERR_PTR on error
|
|
* Locks: config_sema must be held to serialize changes to the port list
|
|
*
|
|
* All port internal structures are set up and the sysfs entry is generated.
|
|
* d_id is used to enqueue ports with a well known address like the Directory
|
|
* Service for nameserver lookup.
|
|
*/
|
|
struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,
|
|
u32 status, u32 d_id)
|
|
{
|
|
struct zfcp_port *port;
|
|
int retval;
|
|
|
|
port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
|
|
if (!port)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
init_waitqueue_head(&port->remove_wq);
|
|
INIT_LIST_HEAD(&port->unit_list_head);
|
|
INIT_WORK(&port->gid_pn_work, zfcp_erp_port_strategy_open_lookup);
|
|
INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work);
|
|
INIT_WORK(&port->rport_work, zfcp_scsi_rport_work);
|
|
|
|
port->adapter = adapter;
|
|
port->d_id = d_id;
|
|
port->wwpn = wwpn;
|
|
port->rport_task = RPORT_NONE;
|
|
|
|
/* mark port unusable as long as sysfs registration is not complete */
|
|
atomic_set_mask(status | ZFCP_STATUS_COMMON_REMOVE, &port->status);
|
|
atomic_set(&port->refcount, 0);
|
|
|
|
dev_set_name(&port->sysfs_device, "0x%016llx",
|
|
(unsigned long long)wwpn);
|
|
port->sysfs_device.parent = &adapter->ccw_device->dev;
|
|
|
|
port->sysfs_device.release = zfcp_sysfs_port_release;
|
|
dev_set_drvdata(&port->sysfs_device, port);
|
|
|
|
read_lock_irq(&zfcp_data.config_lock);
|
|
if (zfcp_get_port_by_wwpn(adapter, wwpn)) {
|
|
read_unlock_irq(&zfcp_data.config_lock);
|
|
goto err_out_free;
|
|
}
|
|
read_unlock_irq(&zfcp_data.config_lock);
|
|
|
|
if (device_register(&port->sysfs_device))
|
|
goto err_out_free;
|
|
|
|
retval = sysfs_create_group(&port->sysfs_device.kobj,
|
|
&zfcp_sysfs_port_attrs);
|
|
|
|
if (retval) {
|
|
device_unregister(&port->sysfs_device);
|
|
goto err_out;
|
|
}
|
|
|
|
zfcp_port_get(port);
|
|
|
|
write_lock_irq(&zfcp_data.config_lock);
|
|
list_add_tail(&port->list, &adapter->port_list_head);
|
|
atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
|
|
atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
|
|
|
|
write_unlock_irq(&zfcp_data.config_lock);
|
|
|
|
zfcp_adapter_get(adapter);
|
|
return port;
|
|
|
|
err_out_free:
|
|
kfree(port);
|
|
err_out:
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
/**
|
|
* zfcp_port_dequeue - dequeues a port from the port list of the adapter
|
|
* @port: pointer to struct zfcp_port which should be removed
|
|
*/
|
|
void zfcp_port_dequeue(struct zfcp_port *port)
|
|
{
|
|
wait_event(port->remove_wq, atomic_read(&port->refcount) == 0);
|
|
write_lock_irq(&zfcp_data.config_lock);
|
|
list_del(&port->list);
|
|
write_unlock_irq(&zfcp_data.config_lock);
|
|
if (port->rport)
|
|
fc_remote_port_delete(port->rport);
|
|
port->rport = NULL;
|
|
zfcp_adapter_put(port->adapter);
|
|
sysfs_remove_group(&port->sysfs_device.kobj, &zfcp_sysfs_port_attrs);
|
|
device_unregister(&port->sysfs_device);
|
|
}
|
|
|
|
/**
|
|
* zfcp_sg_free_table - free memory used by scatterlists
|
|
* @sg: pointer to scatterlist
|
|
* @count: number of scatterlist which are to be free'ed
|
|
* the scatterlist are expected to reference pages always
|
|
*/
|
|
void zfcp_sg_free_table(struct scatterlist *sg, int count)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < count; i++, sg++)
|
|
if (sg)
|
|
free_page((unsigned long) sg_virt(sg));
|
|
else
|
|
break;
|
|
}
|
|
|
|
/**
|
|
* zfcp_sg_setup_table - init scatterlist and allocate, assign buffers
|
|
* @sg: pointer to struct scatterlist
|
|
* @count: number of scatterlists which should be assigned with buffers
|
|
* of size page
|
|
*
|
|
* Returns: 0 on success, -ENOMEM otherwise
|
|
*/
|
|
int zfcp_sg_setup_table(struct scatterlist *sg, int count)
|
|
{
|
|
void *addr;
|
|
int i;
|
|
|
|
sg_init_table(sg, count);
|
|
for (i = 0; i < count; i++, sg++) {
|
|
addr = (void *) get_zeroed_page(GFP_KERNEL);
|
|
if (!addr) {
|
|
zfcp_sg_free_table(sg, i);
|
|
return -ENOMEM;
|
|
}
|
|
sg_set_buf(sg, addr, PAGE_SIZE);
|
|
}
|
|
return 0;
|
|
}
|