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author | Kiyoshi Ueda <k-ueda@ct.jp.nec.com> | 2007-12-11 17:51:23 -0500 |
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committer | Jens Axboe <jens.axboe@oracle.com> | 2008-01-28 10:37:06 +0100 |
commit | aaa04c28cb9a1efd42541fdb7ab648231c2a2263 (patch) | |
tree | 2b72dc095458111f46cf4b535a8d59e08b070bd8 /drivers/ide/ide-cd.c | |
parent | e19a3ab058fe91c8c54d43dc56dccf7eb386478e (diff) | |
download | lwn-aaa04c28cb9a1efd42541fdb7ab648231c2a2263.tar.gz lwn-aaa04c28cb9a1efd42541fdb7ab648231c2a2263.zip |
blk_end_request: changing ide-cd (take 4)
This patch converts ide-cd (cdrom_newpc_intr()) to use blk_end_request
interfaces. Related 'uptodate' arguments are converted to 'error'.
In PIO mode, ide-cd (cdrom_newpc_intr()) needs to defer
end_that_request_last() until the device clears DRQ_STAT and raises
an interrupt after end_that_request_first().
So blk_end_request() has to return without completing request
even if no leftover in the request.
ide-cd uses blk_end_request_callback() and a dummy callback function,
which just returns value '1', to tell blk_end_request_callback()
about that.
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.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 | 49 |
1 files changed, 35 insertions, 14 deletions
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c index 282f1580fca9..74c6087ada38 100644 --- a/drivers/ide/ide-cd.c +++ b/drivers/ide/ide-cd.c @@ -1647,6 +1647,17 @@ static int cdrom_write_check_ireason(ide_drive_t *drive, int len, int ireason) return 1; } +/* + * Called from blk_end_request_callback() after the data of the request + * is completed and before the request is completed. + * By returning value '1', blk_end_request_callback() returns immediately + * without completing the request. + */ +static int cdrom_newpc_intr_dummy_cb(struct request *rq) +{ + return 1; +} + typedef void (xfer_func_t)(ide_drive_t *, void *, u32); /* @@ -1685,9 +1696,13 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive) return ide_error(drive, "dma error", stat); } - end_that_request_chunk(rq, 1, rq->data_len); - rq->data_len = 0; - goto end_request; + spin_lock_irqsave(&ide_lock, flags); + if (__blk_end_request(rq, 0, rq->data_len)) + BUG(); + HWGROUP(drive)->rq = NULL; + spin_unlock_irqrestore(&ide_lock, flags); + + return ide_stopped; } /* @@ -1705,8 +1720,15 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive) /* * If DRQ is clear, the command has completed. */ - if ((stat & DRQ_STAT) == 0) - goto end_request; + if ((stat & DRQ_STAT) == 0) { + spin_lock_irqsave(&ide_lock, flags); + if (__blk_end_request(rq, 0, 0)) + BUG(); + HWGROUP(drive)->rq = NULL; + spin_unlock_irqrestore(&ide_lock, flags); + + return ide_stopped; + } /* * check which way to transfer data @@ -1759,7 +1781,14 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive) rq->data_len -= blen; if (rq->bio) - end_that_request_chunk(rq, 1, blen); + /* + * The request can't be completed until DRQ is cleared. + * So complete the data, but don't complete the request + * using the dummy function for the callback feature + * of blk_end_request_callback(). + */ + blk_end_request_callback(rq, 0, blen, + cdrom_newpc_intr_dummy_cb); else rq->data += blen; } @@ -1780,14 +1809,6 @@ static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive) ide_set_handler(drive, cdrom_newpc_intr, rq->timeout, NULL); return ide_started; - -end_request: - spin_lock_irqsave(&ide_lock, flags); - blkdev_dequeue_request(rq); - end_that_request_last(rq, 1); - HWGROUP(drive)->rq = NULL; - spin_unlock_irqrestore(&ide_lock, flags); - return ide_stopped; } static ide_startstop_t cdrom_write_intr(ide_drive_t *drive) |