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s390/cio: fix unlocked access of global bitmap 

Access to the slow_subchannel_set has to be secured via the
slow_subchannel_lock.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2013-08-29 20:31:06 +02:00 committed by Martin Schwidefsky
parent 57b5918c33
commit eb072a7996
1 changed files with 2 additions and 0 deletions
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2
drivers/s390/cio/css.c
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@ -546,7 +546,9 @@ static int slow_eval_unknown_fn(struct subchannel_id schid, void *data)
case -ENOMEM:
case -EIO:
/* These should abort looping */
spin_lock_irq(&slow_subchannel_lock);
idset_sch_del_subseq(slow_subchannel_set, schid);
spin_unlock_irq(&slow_subchannel_lock);
break;
default:
rc = 0;