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Minor bug fixes for IPMI 

I know this is late; I've been travelling and, well, I've been
 distracted.
 
 This is just a few bug fixes and adding i2c support to the IPMB driver,
 which is something I wanted from the beginning for it.  It would be
 nice for the people doing IPMB to get this in.
 
 -corey
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Merge tag 'for-linus-5.6-1' of https://github.com/cminyard/linux-ipmi

Pull IPMI update from Corey Minyard:
 "Minor bug fixes for IPMI

  I know this is late; I've been travelling and, well, I've been
  distracted.

  This is just a few bug fixes and adding i2c support to the IPMB
  driver, which is something I wanted from the beginning for it"

* tag 'for-linus-5.6-1' of https://github.com/cminyard/linux-ipmi:
  drivers: ipmi: fix off-by-one bounds check that leads to a out-of-bounds write
  ipmi:ssif: Handle a possible NULL pointer reference
  drivers: ipmi: Modify max length of IPMB packet
  drivers: ipmi: Support raw i2c packet in IPMB
alistair/sensors
Linus Torvalds 2020-02-16 13:05:46 -08:00
parent 44024adb4a e0354d147e
commit ab02b61f24
3 changed files with 42 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/driver-api/ipmb.rst
View File

@ -71,9 +71,13 @@ b) Example for device tree::
ipmb@10 {
compatible = "ipmb-dev";
reg = <0x10>;
i2c-protocol;
};
};
If xmit of data to be done using raw i2c block vs smbus
then "i2c-protocol" needs to be defined as above.
2) Manually from Linux::
modprobe ipmb-dev-int

33
drivers/char/ipmi/ipmb_dev_int.c
View File

@ -19,7 +19,7 @@
#include <linux/spinlock.h>
#include <linux/wait.h>
#define MAX_MSG_LEN 128
#define MAX_MSG_LEN 240
#define IPMB_REQUEST_LEN_MIN 7
#define NETFN_RSP_BIT_MASK 0x4
#define REQUEST_QUEUE_MAX_LEN 256
@ -63,6 +63,7 @@ struct ipmb_dev {
spinlock_t lock;
wait_queue_head_t wait_queue;
struct mutex file_mutex;
bool is_i2c_protocol;
};
static inline struct ipmb_dev *to_ipmb_dev(struct file *file)
@ -112,6 +113,25 @@ static ssize_t ipmb_read(struct file *file, char __user *buf, size_t count,
return ret < 0 ? ret : count;
}
static int ipmb_i2c_write(struct i2c_client *client, u8 *msg, u8 addr)
{
struct i2c_msg i2c_msg;
/*
* subtract 1 byte (rq_sa) from the length of the msg passed to
* raw i2c_transfer
*/
i2c_msg.len = msg[IPMB_MSG_LEN_IDX] - 1;
/* Assign message to buffer except first 2 bytes (length and address) */
i2c_msg.buf = msg + 2;
i2c_msg.addr = addr;
i2c_msg.flags = client->flags & I2C_CLIENT_PEC;
return i2c_transfer(client->adapter, &i2c_msg, 1);
}
static ssize_t ipmb_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
@ -133,6 +153,12 @@ static ssize_t ipmb_write(struct file *file, const char __user *buf,
rq_sa = GET_7BIT_ADDR(msg[RQ_SA_8BIT_IDX]);
netf_rq_lun = msg[NETFN_LUN_IDX];
/* Check i2c block transfer vs smbus */
if (ipmb_dev->is_i2c_protocol) {
ret = ipmb_i2c_write(ipmb_dev->client, msg, rq_sa);
return (ret == 1) ? count : ret;
}
/*
* subtract rq_sa and netf_rq_lun from the length of the msg passed to
* i2c_smbus_xfer
@ -253,7 +279,7 @@ static int ipmb_slave_cb(struct i2c_client *client,
break;
case I2C_SLAVE_WRITE_RECEIVED:
if (ipmb_dev->msg_idx >= sizeof(struct ipmb_msg))
if (ipmb_dev->msg_idx >= sizeof(struct ipmb_msg) - 1)
break;
buf[++ipmb_dev->msg_idx] = *val;
@ -302,6 +328,9 @@ static int ipmb_probe(struct i2c_client *client,
if (ret)
return ret;
ipmb_dev->is_i2c_protocol
= device_property_read_bool(&client->dev, "i2c-protocol");
ipmb_dev->client = client;
i2c_set_clientdata(client, ipmb_dev);
ret = i2c_slave_register(client, ipmb_slave_cb);

10
drivers/char/ipmi/ipmi_ssif.c
View File

@ -775,10 +775,14 @@ static void msg_done_handler(struct ssif_info *ssif_info, int result,
flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
msg = ssif_info->curr_msg;
if (msg) {
if (data) {
if (len > IPMI_MAX_MSG_LENGTH)
len = IPMI_MAX_MSG_LENGTH;
memcpy(msg->rsp, data, len);
} else {
len = 0;
}
msg->rsp_size = len;
if (msg->rsp_size > IPMI_MAX_MSG_LENGTH)
msg->rsp_size = IPMI_MAX_MSG_LENGTH;
memcpy(msg->rsp, data, msg->rsp_size);
ssif_info->curr_msg = NULL;
}