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s390/cio: remove invalid condition on IO_SCH_UNREG

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The condition to check the cdev pointer validity on
css_sch_device_unregister() is a leftover from the 'commit 8cc0dcfdc1
("s390/cio: remove pm support from ccw bus driver")'. This could lead to a
situation, where detaching the device is not happening completely. Remove
this invalid condition in the IO_SCH_UNREG case.

Link: https://lore.kernel.org/r/20210423100843.2230969-1-vneethv@linux.ibm.com
Fixes: 8cc0dcfdc1 ("s390/cio: remove pm support from ccw bus driver")
Reported-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Suggested-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Tested-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Tested-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Vineeth Vijayan 2021-04-23 12:08:43 +02:00 committed by Heiko Carstens
parent b0583ab477
commit 2f7484fd73
1 changed files with 1 additions and 2 deletions
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3
drivers/s390/cio/device.c
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@ -1532,8 +1532,7 @@ static int io_subchannel_sch_event(struct subchannel *sch, int process)
switch (action) {
case IO_SCH_ORPH_UNREG:
case IO_SCH_UNREG:
if (!cdev)
css_sch_device_unregister(sch);
css_sch_device_unregister(sch);
break;
case IO_SCH_ORPH_ATTACH:
case IO_SCH_UNREG_ATTACH: