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[SCSI] hpsa: do not give up retry of driver cmds after only 3 retries 

Instead of giving up after 3 immediate retries of driver initiated
commands, back off the rate of retries and retry a bunch more times.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Reviewed-by: Andi Shyti <andi.shyti@gmail.com> 
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Stephen M. Cameron 2012-05-01 11:42:40 -05:00 committed by James Bottomley
parent 852af20aa6
commit 9c2fc1605f
1 changed files with 9 additions and 2 deletions
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11
drivers/scsi/hpsa.c
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@ -1380,17 +1380,24 @@ static void hpsa_scsi_do_simple_cmd_core_if_no_lockup(struct ctlr_info *h,
}
}
#define MAX_DRIVER_CMD_RETRIES 25
static void hpsa_scsi_do_simple_cmd_with_retry(struct ctlr_info *h,
struct CommandList *c, int data_direction)
{
int retry_count = 0;
int backoff_time = 10, retry_count = 0;
do {
memset(c->err_info, 0, sizeof(*c->err_info));
hpsa_scsi_do_simple_cmd_core(h, c);
retry_count++;
if (retry_count > 3) {
msleep(backoff_time);
if (backoff_time < 1000)
backoff_time *= 2;
}
} while ((check_for_unit_attention(h, c) ||
check_for_busy(h, c)) && retry_count <= 3);
check_for_busy(h, c)) &&
retry_count <= MAX_DRIVER_CMD_RETRIES);
hpsa_pci_unmap(h->pdev, c, 1, data_direction);
}