diff options
| 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 /include/scsi/libfc.h | |
| parent | bdbd01ac444bffb3c9aefed3059d12554059b320 (diff) | |
| download | lwn-f281233d3eba15fb225d21ae2e228fd4553d824a.tar.gz lwn-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 'include/scsi/libfc.h')
| -rw-r--r-- | include/scsi/libfc.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h index f986ab7ffe6f..5c4c1678f7be 100644 --- a/include/scsi/libfc.h +++ b/include/scsi/libfc.h @@ -1006,8 +1006,7 @@ void fc_fcp_destroy(struct fc_lport *); /* * SCSI INTERACTION LAYER *****************************/ -int fc_queuecommand(struct scsi_cmnd *, - void (*done)(struct scsi_cmnd *)); +int fc_queuecommand(struct Scsi_Host *, struct scsi_cmnd *); int fc_eh_abort(struct scsi_cmnd *); int fc_eh_device_reset(struct scsi_cmnd *); int fc_eh_host_reset(struct scsi_cmnd *); |