Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=25c61a1fe8c97d1352a2dc0eda25128b3be0db27
Commit: 25c61a1fe8c97d1352a2dc0eda25128b3be0db27
Parent: b70842df77615309d76bcdd63bd289993e0844f2
Author: Cornelia Huck <[EMAIL PROTECTED]>
AuthorDate: Mon Mar 26 20:42:41 2007 +0200
Committer: Heiko Carstens <[EMAIL PROTECTED]>
CommitDate: Mon Mar 26 20:43:47 2007 +0200
[S390] cio: Device status validity.
Only accumulate device status field in irb if it is valid.
Cc: Martin Schwidefsky <[EMAIL PROTECTED]>
Signed-off-by: Cornelia Huck <[EMAIL PROTECTED]>
Signed-off-by: Heiko Carstens <[EMAIL PROTECTED]>
---
drivers/s390/cio/device_status.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/drivers/s390/cio/device_status.c b/drivers/s390/cio/device_status.c
index 6b1caea..25d99bd 100644
--- a/drivers/s390/cio/device_status.c
+++ b/drivers/s390/cio/device_status.c
@@ -263,7 +263,11 @@ ccw_device_accumulate_irb(struct ccw_device *cdev, struct
irb *irb)
cdev_irb->scsw.cpa = irb->scsw.cpa;
/* Accumulate device status, but not the device busy flag. */
cdev_irb->scsw.dstat &= ~DEV_STAT_BUSY;
- cdev_irb->scsw.dstat |= irb->scsw.dstat;
+ /* dstat is not always valid. */
+ if (irb->scsw.stctl &
+ (SCSW_STCTL_PRIM_STATUS | SCSW_STCTL_SEC_STATUS
+ | SCSW_STCTL_INTER_STATUS | SCSW_STCTL_ALERT_STATUS))
+ cdev_irb->scsw.dstat |= irb->scsw.dstat;
/* Accumulate subchannel status. */
cdev_irb->scsw.cstat |= irb->scsw.cstat;
/* Copy residual count if it is valid. */
-
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