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Subject[patch 31/37] SCSI: qla1280: Fix queue depth problem
2.6.25-stable review patch.  If anyone has any objections, please let us
know.

------------------
From: Jeremy Higdon <jeremy@sgi.com>
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>

---
drivers/scsi/qla1280.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -2012,7 +2012,7 @@ qla1280_set_defaults(struct scsi_qla_hos
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_ho
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;

--


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