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authorCornelia Huck <cornelia.huck@de.ibm.com>2007-04-04 08:37:11 -0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-04-04 08:37:39 -0400
commit8c3ce5bece2e6e233c1d05b460883046d020fbf9 (patch)
tree585029efcfa3d8b890ac194ae36b638e8abb1df2 /drivers/s390
parent6e1beb3c22496f6e1f1feba8ae74da16f131684c (diff)
[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')
-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)
221 221
222 cdev_irb = &cdev->private->irb; 222 cdev_irb = &cdev->private->irb;
223 223
224 /*
225 * If the clear function had been performed, all formerly pending
226 * status at the subchannel has been cleared and we must not pass
227 * intermediate accumulated status to the device driver.
228 */
229 if (irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC)
230 memset(&cdev->private->irb, 0, sizeof(struct irb));
231
224 /* Copy bits which are valid only for the start function. */ 232 /* Copy bits which are valid only for the start function. */
225 if (irb->scsw.fctl & SCSW_FCTL_START_FUNC) { 233 if (irb->scsw.fctl & SCSW_FCTL_START_FUNC) {
226 /* Copy key. */ 234 /* Copy key. */