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authorTejun Heo <tj@kernel.org>2008-07-31 16:08:02 +0900
committerJeff Garzik <jgarzik@redhat.com>2008-08-22 02:19:41 -0400
commit5dbfc9cb59d4ad75199949d7dd8a8c6d7bc518df (patch)
treeb0574dea3b5bfcf9418abb1a08bfe24a77fbcd37 /drivers
parenta674050e068a2919908730279f0b731ae6d2e005 (diff)
downloadop-kernel-dev-5dbfc9cb59d4ad75199949d7dd8a8c6d7bc518df.zip
op-kernel-dev-5dbfc9cb59d4ad75199949d7dd8a8c6d7bc518df.tar.gz
libata: always do follow-up SRST if hardreset returned -EAGAIN
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/ata/libata-eh.c20
1 files changed, 6 insertions, 14 deletions
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index c98909b..d4dad47 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -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 "
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