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| author | Peter Oberparleiter <peter.oberparleiter@de.ibm.com> | 2006-04-27 18:40:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-28 08:33:47 -0700 |
| commit | 329b785bcee5d001f97a33bdb80de014bb5020b0 (patch) | |
| tree | 795cbbba999f83c3e61a87135dde088b574c7406 /drivers | |
| parent | bcff5cd667da6eb3df9173626497e3e69b004e42 (diff) | |
| download | linux-329b785bcee5d001f97a33bdb80de014bb5020b0.tar.gz linux-329b785bcee5d001f97a33bdb80de014bb5020b0.tar.bz2 linux-329b785bcee5d001f97a33bdb80de014bb5020b0.zip | |
[PATCH] 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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/s390/cio/chsc.c | 26 |
1 files changed, 4 insertions, 22 deletions
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c index 6412b2c3edd3..daedb00a4346 100644 --- a/drivers/s390/cio/chsc.c +++ b/drivers/s390/cio/chsc.c @@ -242,28 +242,10 @@ s390_subchannel_remove_chpid(struct device *dev, void *data) 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); |