From: Sebastian Ott <sebott@linux.vnet.ibm.com>
Date: Thu, 29 Aug 2013 18:31:06 +0000 (+0200)
Subject: s390/cio: fix unlocked access of global bitmap
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=eb072a7996467937a1582d0188ed082768902a5a;p=linux-beck.git

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>
---

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 4eb2a54e64f2..8c2cb87bccc5 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -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;