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

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>

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index ee9bb53..5309c31 100644 (file)
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2003,14 +2003,10 @@ static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
        ehc->tries[dev->devno]--;
 
        switch (rc) {
-       case -EINVAL:
-               /* eeek, something went very wrong, give up */
-               ehc->tries[dev->devno] = 0;
-               break;
-
        case -ENODEV:
                /* device missing or wrong IDENTIFY data, schedule probing */
                ehc->i.probe_mask |= (1 << dev->devno);
+       case -EINVAL:
                /* give it just one more chance */
                ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1);
        case -EIO: