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libata: add no penalty retry request for EH device handling routines 

Let -EAGAIN from EH device handling routines trigger EH retry without
consuming its tries count.  This will be used to implement link SPD
horkage which requires hardreset to adjust SPD without affecting other
EH decisions.  As it bypasses the forward progress guarantee provided
by the tries count, the requester is responsible for ensuring forward
progress.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo 2009-01-29 20:31:35 +09:00 committed by Jeff Garzik
parent c2c7a89c5e
commit cf9a590a9e
1 changed files with 5 additions and 1 deletions
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6
drivers/ata/libata-eh.c
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@ -3035,7 +3035,11 @@ static int ata_eh_handle_dev_fail(struct ata_device *dev, int err)
{
struct ata_eh_context *ehc = &dev->link->eh_context;
ehc->tries[dev->devno]--;
/* -EAGAIN from EH routine indicates retry without prejudice.
* The requester is responsible for ensuring forward progress.
*/
if (err != -EAGAIN)
ehc->tries[dev->devno]--;
switch (err) {
case -ENODEV: