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[S390] dasd: prevent IO error during reserve/release loop

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The termination of running CQR caused by reserve/release operations
may lead to an IO error if reserve/release is done in a tight loop.
Prevent this by increasing the retry counter after termination.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Stefan Haberland 2011-05-10 17:13:38 +02:00 committed by Martin Schwidefsky
parent fdb1bb1575
commit aade6c0dfb
1 changed files with 10 additions and 1 deletions
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11
drivers/s390/block/dasd.c
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@ -1742,11 +1742,20 @@ int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
static inline int _dasd_term_running_cqr(struct dasd_device *device)
{
struct dasd_ccw_req *cqr;
int rc;
if (list_empty(&device->ccw_queue))
return 0;
cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
return device->discipline->term_IO(cqr);
rc = device->discipline->term_IO(cqr);
if (!rc)
/*
* CQR terminated because a more important request is pending.
* Undo decreasing of retry counter because this is
* not an error case.
*/
cqr->retries++;
return rc;
}
int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)