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[SCSI] qla2xxx: Correct excessive delay during LOAD-RISC-RAM mailbox command.

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Problem report (against 2.4.x driver) from Jeff Layton
<jlayton@redhat.com>:

An OEM noticed that the U6 qla2200 driver would hang for
around 2 minutes at boot time and then proceed normally. I
found that the delay was occurring when loading the new
firmware into the card, and was due to a
schedule_timeout(10) added to the bottom of the polling
loop.

Some testing showed that the load ram operation on the card
was very quick (on the order of a couple of jiffies), but
the sleep in the polling loop was making each operation take
around 25-30.

The attached patch corrects this by making it skip sleeping
during the load ram operation, since I believe we only do
that when the module is plugged in. It also skips sleeping
if the mbox_int flag got set during the current loop.

This corrected the hang on my test setup, and OEM also
confirmed that it corrected the problem for them.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
andrew.vasquez@qlogic.com 2006-01-13 17:05:10 -08:00 committed by James Bottomley
parent 03ab2eabed
commit 5998983113
1 changed files with 3 additions and 1 deletions
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4
drivers/scsi/qla2xxx/qla_mbx.c
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@ -196,7 +196,9 @@ qla2x00_mailbox_command(scsi_qla_host_t *ha, mbx_cmd_t *mcp)
/* Check for pending interrupts. */
qla2x00_poll(ha);
msleep(10);
if (command != MBC_LOAD_RISC_RAM_EXTENDED &&
!ha->flags.mbox_int)
msleep(10);
} /* while */
}