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[S390] cio: fix double unregistering of subchannels

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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: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2008-07-14 09:59:20 +02:00 committed by Heiko Carstens
parent e0bc24958e
commit ef60cd13ec
1 changed files with 2 additions and 1 deletions
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3
drivers/s390/cio/css.c
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@ -164,7 +164,8 @@ 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);
device_unregister(&sch->dev); if (device_is_registered(&sch->dev))
device_unregister(&sch->dev);
mutex_unlock(&sch->reg_mutex); mutex_unlock(&sch->reg_mutex);
} }
EXPORT_SYMBOL_GPL(css_sch_device_unregister); EXPORT_SYMBOL_GPL(css_sch_device_unregister);