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libata: always do follow-up SRST if hardreset returned -EAGAIN

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As an optimization, follow-up SRST used to be skipped if
classification wasn't requested even when hardreset requested it via
-EAGAIN.  However, some hardresets can't wait for device readiness and
skipping SRST can cause timeout or other failures during revalidation.
Always perform follow-up SRST if hardreset returns -EAGAIN.  This
makes reset paths more predictable and thus less error-prone.

While at it, move hardreset error checking such that it's done right
after hardreset is finished.  This simplifies followup SRST condition
check a bit and makes the reset path easier to modify.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo 2008-07-31 16:08:02 +09:00 committed by Jeff Garzik
parent a674050e06
commit 5dbfc9cb59
1 changed files with 6 additions and 14 deletions
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20
drivers/ata/libata-eh.c
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@ -2171,18 +2171,12 @@ static int ata_do_reset(struct ata_link *link, ata_reset_fn_t reset,
}
static int ata_eh_followup_srst_needed(struct ata_link *link,
int rc, int classify,
const unsigned int *classes)
int rc, const unsigned int *classes)
{
if ((link->flags & ATA_LFLAG_NO_SRST) || ata_link_offline(link))
return 0;
if (rc == -EAGAIN) {
if (classify)
return 1;
rc = 0;
}
if (rc != 0)
return 0;
if (rc == -EAGAIN)
return 1;
if (sata_pmp_supported(link->ap) && ata_is_host_link(link))
return 1;
return 0;
@ -2309,9 +2303,11 @@ int ata_eh_reset(struct ata_link *link, int classify,
ehc->i.flags |= ATA_EHI_DID_SOFTRESET;
rc = ata_do_reset(link, reset, classes, deadline);
if (rc && rc != -EAGAIN)
goto fail;
if (reset == hardreset &&
ata_eh_followup_srst_needed(link, rc, classify, classes)) {
ata_eh_followup_srst_needed(link, rc, classes)) {
/* okay, let's do follow-up softreset */
reset = softreset;
@ -2326,10 +2322,6 @@ int ata_eh_reset(struct ata_link *link, int classify,
ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
rc = ata_do_reset(link, reset, classes, deadline);
}
/* -EAGAIN can happen if we skipped followup SRST */
if (rc && rc != -EAGAIN)
goto fail;
} else {
if (verbose)
ata_link_printk(link, KERN_INFO, "no reset method "