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| author | Stefan Haberland <stefan.haberland@de.ibm.com> | 2011-05-10 17:13:38 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2011-05-10 17:13:42 +0200 |
| commit | aade6c0dfb46ff7ce7df0ed7a2ef15d2d3c47f05 (patch) | |
| tree | a4fca8380efa83444a7256a038ad29b545bbf6ed /drivers/s390 | |
| parent | fdb1bb157525907163e2a0c96fe8bb19fbe867a8 (diff) | |
| download | linux-aade6c0dfb46ff7ce7df0ed7a2ef15d2d3c47f05.tar.bz2 | |
[S390] dasd: prevent IO error during reserve/release loop
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>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/block/dasd.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index 475e603fc584..86b6f1cc1b10 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -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) |