From: Martin Schwidefsky <schwidefsky@de.ibm.com>
To: linux-kernel@vger.kernel.org, akpm@osdl.org,
peter.oberparleiter@de.ibm.com
Subject: [patch 1/13] s390: fix I/O termination race in cio.
Date: Mon, 24 Apr 2006 17:02:30 +0200 [thread overview]
Message-ID: <20060424150230.GB15613@skybase> (raw)
From: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
[patch 1/13] s390: fix I/O termination race in cio.
Fix a race condition in the I/O termination logic. The race can
cause I/O to a dasd device to fail with no retry left after turning
one channel path to the device off and on multiple times.
Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---
drivers/s390/cio/chsc.c | 26 ++++----------------------
1 files changed, 4 insertions(+), 22 deletions(-)
diff -urpN linux-2.6/drivers/s390/cio/chsc.c linux-2.6-patched/drivers/s390/cio/chsc.c
--- linux-2.6/drivers/s390/cio/chsc.c 2006-04-24 16:47:00.000000000 +0200
+++ linux-2.6-patched/drivers/s390/cio/chsc.c 2006-04-24 16:47:18.000000000 +0200
@@ -242,28 +242,10 @@ s390_subchannel_remove_chpid(struct devi
if (sch->vpm == mask)
goto out_unreg;
- if ((sch->schib.scsw.actl & (SCSW_ACTL_CLEAR_PEND |
- SCSW_ACTL_HALT_PEND |
- SCSW_ACTL_START_PEND |
- SCSW_ACTL_RESUME_PEND)) &&
- (sch->schib.pmcw.lpum == mask)) {
- int cc = cio_cancel(sch);
-
- if (cc == -ENODEV)
- goto out_unreg;
-
- if (cc == -EINVAL) {
- cc = cio_clear(sch);
- if (cc == -ENODEV)
- goto out_unreg;
- /* Call handler. */
- if (sch->driver && sch->driver->termination)
- sch->driver->termination(&sch->dev);
- goto out_unlock;
- }
- } else if ((sch->schib.scsw.actl & SCSW_ACTL_DEVACT) &&
- (sch->schib.scsw.actl & SCSW_ACTL_SCHACT) &&
- (sch->schib.pmcw.lpum == mask)) {
+ if ((sch->schib.scsw.actl & SCSW_ACTL_DEVACT) &&
+ (sch->schib.scsw.actl & SCSW_ACTL_SCHACT) &&
+ (sch->schib.pmcw.lpum == mask) &&
+ (sch->vpm == 0)) {
int cc;
cc = cio_clear(sch);
reply other threads:[~2006-04-24 15:02 UTC|newest]
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