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| author | Jeff Garzik <jeff@garzik.org> | 2010-11-16 02:10:29 -0500 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-11-16 13:33:23 -0800 |
| commit | f281233d3eba15fb225d21ae2e228fd4553d824a (patch) | |
| tree | 51134454ba8acb558735f90be5540f7d756483e3 /drivers/scsi/eata_pio.c | |
| parent | bdbd01ac444bffb3c9aefed3059d12554059b320 (diff) | |
| download | linux-stable-f281233d3eba15fb225d21ae2e228fd4553d824a.tar.gz linux-stable-f281233d3eba15fb225d21ae2e228fd4553d824a.tar.bz2 linux-stable-f281233d3eba15fb225d21ae2e228fd4553d824a.zip | |
SCSI host lock push-down
Move the mid-layer's ->queuecommand() invocation from being locked
with the host lock to being unlocked to facilitate speeding up the
critical path for drivers who don't need this lock taken anyway.
The patch below presents a simple SCSI host lock push-down as an
equivalent transformation. No locking or other behavior should change
with this patch. All existing bugs and locking orders are preserved.
Additionally, add one parameter to queuecommand,
struct Scsi_Host *
and remove one parameter from queuecommand,
void (*done)(struct scsi_cmnd *)
Scsi_Host* is a convenient pointer that most host drivers need anyway,
and 'done' is redundant to struct scsi_cmnd->scsi_done.
Minimal code disturbance was attempted with this change. Most drivers
needed only two one-line modifications for their host lock push-down.
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Acked-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/scsi/eata_pio.c')
| -rw-r--r-- | drivers/scsi/eata_pio.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/scsi/eata_pio.c b/drivers/scsi/eata_pio.c index 60886c19065e..4a9641e69f54 100644 --- a/drivers/scsi/eata_pio.c +++ b/drivers/scsi/eata_pio.c @@ -335,7 +335,7 @@ static inline unsigned int eata_pio_send_command(unsigned long base, unsigned ch return 0; } -static int eata_pio_queue(struct scsi_cmnd *cmd, +static int eata_pio_queue_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) { unsigned int x, y; @@ -438,6 +438,8 @@ static int eata_pio_queue(struct scsi_cmnd *cmd, return 0; } +static DEF_SCSI_QCMD(eata_pio_queue) + static int eata_pio_abort(struct scsi_cmnd *cmd) { unsigned int loop = 100; |