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authorJeff Garzik <jeff@garzik.org>2010-11-16 02:10:29 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2010-11-16 13:33:23 -0800
commitf281233d3eba15fb225d21ae2e228fd4553d824a (patch)
tree51134454ba8acb558735f90be5540f7d756483e3 /drivers/scsi/wd33c93.c
parentbdbd01ac444bffb3c9aefed3059d12554059b320 (diff)
downloadop-kernel-dev-f281233d3eba15fb225d21ae2e228fd4553d824a.zip
op-kernel-dev-f281233d3eba15fb225d21ae2e228fd4553d824a.tar.gz
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/wd33c93.c')
-rw-r--r--drivers/scsi/wd33c93.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/scsi/wd33c93.c b/drivers/scsi/wd33c93.c
index b701bf2..5f697e0 100644
--- a/drivers/scsi/wd33c93.c
+++ b/drivers/scsi/wd33c93.c
@@ -371,8 +371,8 @@ calc_sync_msg(unsigned int period, unsigned int offset, unsigned int fast,
msg[1] = offset;
}
-int
-wd33c93_queuecommand(struct scsi_cmnd *cmd,
+static int
+wd33c93_queuecommand_lck(struct scsi_cmnd *cmd,
void (*done)(struct scsi_cmnd *))
{
struct WD33C93_hostdata *hostdata;
@@ -468,6 +468,8 @@ wd33c93_queuecommand(struct scsi_cmnd *cmd,
return 0;
}
+DEF_SCSI_QCMD(wd33c93_queuecommand)
+
/*
* This routine attempts to start a scsi command. If the host_card is
* already connected, we give up immediately. Otherwise, look through
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