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authorJeff Garzik <jeff@garzik.org>2010-11-16 08:10:29 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2010-11-16 22:33:23 +0100
commitf281233d3eba15fb225d21ae2e228fd4553d824a (patch)
tree51134454ba8acb558735f90be5540f7d756483e3 /drivers/scsi/aha1740.c
parentMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jba... (diff)
downloadlinux-f281233d3eba15fb225d21ae2e228fd4553d824a.tar.xz
linux-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/aha1740.c')
-rw-r--r--drivers/scsi/aha1740.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/scsi/aha1740.c b/drivers/scsi/aha1740.c
index 0107a4cc3331..d058f1ab82b5 100644
--- a/drivers/scsi/aha1740.c
+++ b/drivers/scsi/aha1740.c
@@ -331,7 +331,7 @@ static irqreturn_t aha1740_intr_handle(int irq, void *dev_id)
return IRQ_RETVAL(handled);
}
-static int aha1740_queuecommand(Scsi_Cmnd * SCpnt, void (*done)(Scsi_Cmnd *))
+static int aha1740_queuecommand_lck(Scsi_Cmnd * SCpnt, void (*done)(Scsi_Cmnd *))
{
unchar direction;
unchar *cmd = (unchar *) SCpnt->cmnd;
@@ -503,6 +503,8 @@ static int aha1740_queuecommand(Scsi_Cmnd * SCpnt, void (*done)(Scsi_Cmnd *))
return 0;
}
+static DEF_SCSI_QCMD(aha1740_queuecommand)
+
/* Query the board for its irq_level and irq_type. Nothing else matters
in enhanced mode on an EISA bus. */