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[S390] cio: Dont fail probe for I/O subchannels.

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If we fail the probe for an I/O subchannel, we won't be able
to unregister it again since there are no sch_event()
callbacks for unbound subchannels. Just succeed the probe in
any case and schedule unregistering the subchannel.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Cornelia Huck 2008-12-25 13:39:09 +01:00 committed by Martin Schwidefsky
parent 5fb6b8544d
commit 90ed2b692f
2 changed files with 32 additions and 12 deletions
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1
drivers/s390/cio/cio.h
View file

@ -82,6 +82,7 @@ struct subchannel {
struct device dev; /* entry in device tree */
struct css_driver *driver;
void *private; /* private per subchannel type data */
struct work_struct work;
} __attribute__ ((aligned(8)));
#define IO_INTERRUPT_TYPE 0 /* I/O interrupt type */

43
drivers/s390/cio/device.c
View file

@ -1196,6 +1196,30 @@ static void io_subchannel_init_fields(struct subchannel *sch)
sch->schib.mba = 0;
}
static void io_subchannel_do_unreg(struct work_struct *work)
{
struct subchannel *sch;
sch = container_of(work, struct subchannel, work);
css_sch_device_unregister(sch);
/* Reset intparm to zeroes. */
sch->schib.pmcw.intparm = 0;
cio_modify(sch);
put_device(&sch->dev);
}
/* Schedule unregister if we have no cdev. */
static void io_subchannel_schedule_removal(struct subchannel *sch)
{
get_device(&sch->dev);
INIT_WORK(&sch->work, io_subchannel_do_unreg);
queue_work(slow_path_wq, &sch->work);
}
/*
* Note: We always return 0 so that we bind to the device even on error.
* This is needed so that our remove function is called on unregister.
*/
static int io_subchannel_probe(struct subchannel *sch)
{
struct ccw_device *cdev;
@ -1238,14 +1262,12 @@ static int io_subchannel_probe(struct subchannel *sch)
rc = sysfs_create_group(&sch->dev.kobj,
&io_subchannel_attr_group);
if (rc)
return rc;
goto out_schedule;
/* Allocate I/O subchannel private data. */
sch->private = kzalloc(sizeof(struct io_subchannel_private),
GFP_KERNEL | GFP_DMA);
if (!sch->private) {
rc = -ENOMEM;
if (!sch->private)
goto out_err;
}
/*
* First check if a fitting device may be found amongst the
* disconnected devices or in the orphanage.
@ -1269,24 +1291,21 @@ static int io_subchannel_probe(struct subchannel *sch)
return 0;
}
cdev = io_subchannel_create_ccwdev(sch);
if (IS_ERR(cdev)) {
rc = PTR_ERR(cdev);
if (IS_ERR(cdev))
goto out_err;
}
rc = io_subchannel_recog(cdev, sch);
if (rc) {
spin_lock_irqsave(sch->lock, flags);
sch_set_cdev(sch, NULL);
io_subchannel_recog_done(cdev);
spin_unlock_irqrestore(sch->lock, flags);
if (cdev->dev.release)
cdev->dev.release(&cdev->dev);
goto out_err;
}
return 0;
out_err:
kfree(sch->private);
sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
return rc;
out_schedule:
io_subchannel_schedule_removal(sch);
return 0;
}
static int