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Commit ef60cd13 authored by Sebastian Ott's avatar Sebastian Ott Committed by Heiko Carstens
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[S390] cio: fix double unregistering of subchannels 



In some cases where the channel subsystem decides to drop a subchannel
device device_unregister may be called twice, which results in an oops.
The patch prevents this by only unregistering registered devices.

Signed-off-by: default avatarSebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent e0bc2495

drivers/s390/cio/css.c

+2 −1
Original line number Original line Diff line number Diff line
@@ -164,6 +164,7 @@ static int css_sch_device_register(struct subchannel *sch) 
void css_sch_device_unregister(struct subchannel *sch)

void css_sch_device_unregister(struct subchannel *sch)

{

{

	mutex_lock(&sch->reg_mutex);

	mutex_lock(&sch->reg_mutex);

	if (device_is_registered(&sch->dev))

		device_unregister(&sch->dev);

		device_unregister(&sch->dev);

	mutex_unlock(&sch->reg_mutex);

	mutex_unlock(&sch->reg_mutex);

}

}