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authorStefan Bader <shbader@de.ibm.com>2006-03-24 06:15:26 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-24 10:33:17 -0500
commit842d3fba94ed94cc5de7b712e0f4218ce6e4fd73 (patch)
tree2650ba0ce392479ede2c210cf58c3690c6b004c0
parent20c644680af1ef9a6b36c0873f59498c98b07ab1 (diff)
[PATCH] s390: tape retry flooding by deferred CC in interrupt
If a deferred CC happens there will be lots of messages, because the retry is done immediatly in the interrupt handler which can be too fast. To avoid this requeue the request and schedule the queue to be processed. Signed-off-by: Stefan Bader <shbader@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>
-rw-r--r--drivers/s390/char/tape_core.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/s390/char/tape_core.c b/drivers/s390/char/tape_core.c
index 4ea438c749c9..c42f5e25024e 100644
--- a/drivers/s390/char/tape_core.c
+++ b/drivers/s390/char/tape_core.c
@@ -1064,15 +1064,16 @@ __tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1064 /* 1064 /*
1065 * If the condition code is not zero and the start function bit is 1065 * If the condition code is not zero and the start function bit is
1066 * still set, this is an deferred error and the last start I/O did 1066 * still set, this is an deferred error and the last start I/O did
1067 * not succeed. Restart the request now. 1067 * not succeed. At this point the condition that caused the deferred
1068 * error might still apply. So we just schedule the request to be
1069 * started later.
1068 */ 1070 */
1069 if (irb->scsw.cc != 0 && (irb->scsw.fctl & SCSW_FCTL_START_FUNC)) { 1071 if (irb->scsw.cc != 0 && (irb->scsw.fctl & SCSW_FCTL_START_FUNC)) {
1070 PRINT_WARN("(%s): deferred cc=%i. restaring\n", 1072 PRINT_WARN("(%s): deferred cc=%i. restaring\n",
1071 cdev->dev.bus_id, 1073 cdev->dev.bus_id,
1072 irb->scsw.cc); 1074 irb->scsw.cc);
1073 rc = __tape_start_io(device, request); 1075 request->status = TAPE_REQUEST_QUEUED;
1074 if (rc) 1076 schedule_work(&device->tape_dnr);
1075 __tape_end_request(device, request, rc);
1076 return; 1077 return;
1077 } 1078 }
1078 1079