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authorSebastian Ott <sebott@linux.vnet.ibm.com>2008-07-14 09:59:20 +0200
committerHeiko Carstens <heiko.carstens@de.ibm.com>2008-07-14 10:02:17 +0200
commitef60cd13ecee0ccf2439d63013cbfc798aea2bb9 (patch)
tree1d0dff750b0c031a1476d14a4fc2dd5071a08aaf /drivers/s390
parente0bc24958e1305efe176adc9d5f23a09e84c0058 (diff)
[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: 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>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/cio/css.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 4e2f2bbf4ba..46c021d880d 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -164,7 +164,8 @@ static int css_sch_device_register(struct subchannel *sch)
void css_sch_device_unregister(struct subchannel *sch)
{
mutex_lock(&sch->reg_mutex);
- device_unregister(&sch->dev);
+ if (device_is_registered(&sch->dev))
+ device_unregister(&sch->dev);
mutex_unlock(&sch->reg_mutex);
}
EXPORT_SYMBOL_GPL(css_sch_device_unregister);