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authorCornelia Huck <cornelia.huck@de.ibm.com>2007-04-04 16:37:11 +0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-04-04 16:37:39 +0400
commit8c3ce5bece2e6e233c1d05b460883046d020fbf9 (patch)
tree585029efcfa3d8b890ac194ae36b638e8abb1df2 /drivers/s390/cio/device_status.c
parent6e1beb3c22496f6e1f1feba8ae74da16f131684c (diff)
downloadlinux-8c3ce5bece2e6e233c1d05b460883046d020fbf9.tar.xz
[S390] cio: Fix handling of interrupt for csch().
Wipe internal irb if the clear function bit is set before accumulating bits from the irb in order to follow hardware behaviour. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/device_status.c')
-rw-r--r--drivers/s390/cio/device_status.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/s390/cio/device_status.c b/drivers/s390/cio/device_status.c
index 25d99bd28089..aa96e6752592 100644
--- a/drivers/s390/cio/device_status.c
+++ b/drivers/s390/cio/device_status.c
@@ -221,6 +221,14 @@ ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb)
cdev_irb = &cdev->private->irb;
+ /*
+ * If the clear function had been performed, all formerly pending
+ * status at the subchannel has been cleared and we must not pass
+ * intermediate accumulated status to the device driver.
+ */
+ if (irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC)
+ memset(&cdev->private->irb, 0, sizeof(struct irb));
+
/* Copy bits which are valid only for the start function. */
if (irb->scsw.fctl & SCSW_FCTL_START_FUNC) {
/* Copy key. */