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s390/dasd: fix inability to set a DASD device offline 

Fix ref counting for DASD devices leading to an inability to set a
DASD device offline.
Before a worker is scheduled the DASD device driver takes a reference
to the device. If the worker was already scheduled this reference was
never freed.
Fix by giving the reference to the DASD device free when
schedule_work() returns false.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Stefan Haberland 2015-04-02 12:27:25 +02:00 committed by Martin Schwidefsky
parent 8741ce6d11
commit f2608cd4a3
2 changed files with 8 additions and 4 deletions
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9
drivers/s390/block/dasd.c
View File

@ -579,7 +579,8 @@ void dasd_kick_device(struct dasd_device *device)
{
dasd_get_device(device);
/* queue call to dasd_kick_device to the kernel event daemon. */
schedule_work(&device->kick_work);
if (!schedule_work(&device->kick_work))
dasd_put_device(device);
}
EXPORT_SYMBOL(dasd_kick_device);
@ -599,7 +600,8 @@ void dasd_reload_device(struct dasd_device *device)
{
dasd_get_device(device);
/* queue call to dasd_reload_device to the kernel event daemon. */
schedule_work(&device->reload_device);
if (!schedule_work(&device->reload_device))
dasd_put_device(device);
}
EXPORT_SYMBOL(dasd_reload_device);
@ -619,7 +621,8 @@ void dasd_restore_device(struct dasd_device *device)
{
dasd_get_device(device);
/* queue call to dasd_restore_device to the kernel event daemon. */
schedule_work(&device->restore_device);
if (!schedule_work(&device->restore_device))
dasd_put_device(device);
}
/*

3
drivers/s390/block/dasd_eckd.c
View File

@ -1628,7 +1628,8 @@ static void dasd_eckd_kick_validate_server(struct dasd_device *device)
return;
}
/* queue call to do_validate_server to the kernel event daemon. */
schedule_work(&device->kick_validate);
if (!schedule_work(&device->kick_validate))
dasd_put_device(device);
}
static u32 get_fcx_max_data(struct dasd_device *device)