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authorJeremy Higdon <jeremy@sgi.com>2008-05-13 19:10:09 +0000
committerGreg Kroah-Hartman <gregkh@suse.de>2008-05-15 07:50:07 -0700
commit76188088d6cbef84417e0a762c68de5801cb135c (patch)
parent05d5b6cf37de1a9ceb873b770de113861a5b3df9 (diff)
SCSI: qla1280: Fix queue depth problem
commit af5741c6de4f4a1d8608b0f00867c77cb7123635 upstream The qla1280 driver was ANDing the output value of mailbox register 0 with (1 << target-number) to determine whether to enable queueing on the target in question. But mailbox register 0 has the status code for the mailbox command (in this case, Set Target Parameters). Potential values are: /* * ISP mailbox command complete status codes */ So clearly that is in error. I can't think what the author of that line was looking for in a mailbox register, so I just eliminated the AND. flag is used later in the function, and I think that the later usage was also wrong, though it was used to set values that aren't used. Oh well, an overhaul of this driver is not what I want to do now -- just a bugfix. After the fix, I found that my disks were getting a queue depth of 255, which is far too many. Most SCSI disks are limited to 32 or 64. In any case, there's no point, queueing up a bunch of commands to the adapter that will just result in queue full or starve other targets from being issued commands due to running out of internal memory. So I dropped default queue depth to 32 (from which 1 is subtracted elsewhere, giving net of 31). I tested with a Seagate ST336753LC, and results look good, so I'm satisfied with this patch. Signed-off-by: Jeremy Higdon <jeremy@sgi.com> Acked-by: Jes Sorensen <jes@sgi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
index 68c0d09ffe78..624e6167b991 100644
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -2012,7 +2012,7 @@ qla1280_set_defaults(struct scsi_qla_host *ha)
nv->bus[bus].config_2.req_ack_active_negation = 1;
nv->bus[bus].config_2.data_line_active_negation = 1;
nv->bus[bus].selection_timeout = 250;
- nv->bus[bus].max_queue_depth = 256;
+ nv->bus[bus].max_queue_depth = 32;
if (IS_ISP1040(ha)) {
nv->bus[bus].bus_reset_delay = 3;
@@ -2056,7 +2056,7 @@ qla1280_config_target(struct scsi_qla_host *ha, int bus, int target)
status = qla1280_mailbox_command(ha, 0x0f, mb);
/* Save Tag queuing enable flag. */
- flag = (BIT_0 << target) & mb[0];
+ flag = (BIT_0 << target);
if (nv->bus[bus].target[target].parameter.tag_queuing)
ha->bus_settings[bus].qtag_enables |= flag;