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libata: give devices one last chance even if recovery failed with -EINVAL

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After certain errors, some devices report complete garbage on
IDENTIFY.  This can cause ata_dev_read_id() to fail with -EINVAL
resulting in immediate disabling of the device.  Give the device one
last chance after -EINVAL to allow recovery from such situations.  As
-EINVAL is triggered very rarely, this shouldn't cause any noticeable
affect on more common error paths.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Harald Dunkel <harald.dunkel@t-online.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-05-11 14:46:51 +02:00 committed by Jeff Garzik
parent 54936f8b09
commit 8575b81409
1 changed files with 1 additions and 5 deletions
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6
drivers/ata/libata-eh.c
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@ -2003,14 +2003,10 @@ static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
ehc->tries[dev->devno]--; ehc->tries[dev->devno]--;
switch (rc) { switch (rc) {
case -EINVAL:
/* eeek, something went very wrong, give up */
ehc->tries[dev->devno] = 0;
break;
case -ENODEV: case -ENODEV:
/* device missing or wrong IDENTIFY data, schedule probing */ /* device missing or wrong IDENTIFY data, schedule probing */
ehc->i.probe_mask |= (1 << dev->devno); ehc->i.probe_mask |= (1 << dev->devno);
case -EINVAL:
/* give it just one more chance */ /* give it just one more chance */
ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1); ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1);
case -EIO: case -EIO: