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>
diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
index 9c73dbd..606215e 100644
--- a/drivers/scsi/stex.c
+++ b/drivers/scsi/stex.c
@@ -572,7 +572,7 @@
}
static int
-stex_queuecommand(struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *))
+stex_queuecommand_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
{
struct st_hba *hba;
struct Scsi_Host *host;
@@ -698,6 +698,8 @@
return 0;
}
+static DEF_SCSI_QCMD(stex_queuecommand)
+
static void stex_scsi_done(struct st_ccb *ccb)
{
struct scsi_cmnd *cmd = ccb->cmd;