diff options
| author | Tejun Heo <tj@kernel.org> | 2009-05-08 06:53:59 +0400 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-05-11 11:52:14 +0400 |
| commit | 8f6205cd572fece673da0255d74843680f67f879 (patch) | |
| tree | bb89c1c5fe4436f5a0ec27f0d96074c7031a83ae /drivers/ide/ide-cd.c | |
| parent | 1011c1b9f2e45ce7c6e38888d2b83936aec38771 (diff) | |
| download | linux-8f6205cd572fece673da0255d74843680f67f879.tar.xz | |
ide: dequeue in-flight request
ide generally has single request in flight and tracks it using
hwif->rq and all state handlers follow the following convention.
* ide_started is returned if the request is in flight.
* ide_stopped is returned if the queue needs to be restarted. The
request might or might not have been processed fully or partially.
* hwif->rq is set to NULL, when an issued request completes.
So, dequeueing model can be implemented by dequeueing after fetch,
requeueing if hwif->rq isn't NULL on ide_stopped return and doing
about the same thing on completion / port unlock paths. These changes
can be made in ide-io proper.
In addition to the above main changes, the following updates are
necessary.
* ide-cd shouldn't dequeue a request when issuing REQUEST SENSE for it
as the request is already dequeued.
* ide-atapi uses request queue as stack when issuing REQUEST SENSE to
put the REQUEST SENSE in front of the failed request. This now
needs to be done using requeueing.
[ Impact: dequeue in-flight request ]
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Borislav Petkov <petkovbb@googlemail.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/ide/ide-cd.c')
| -rw-r--r-- | drivers/ide/ide-cd.c | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c index 2eadc9d2e965..4c7792fd5f93 100644 --- a/drivers/ide/ide-cd.c +++ b/drivers/ide/ide-cd.c @@ -405,15 +405,7 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat) end_request: if (stat & ATA_ERR) { - struct request_queue *q = drive->queue; - unsigned long flags; - - spin_lock_irqsave(q->queue_lock, flags); - blkdev_dequeue_request(rq); - spin_unlock_irqrestore(q->queue_lock, flags); - hwif->rq = NULL; - return ide_queue_sense_rq(drive, rq) ? 2 : 1; } else return 2; |