[libata] sata_mv: errata check buglet fix

Fix a buglet; the errata check below this code is assuming the value in
the sstatus variable is what was pulled out of the SCR_STATUS register.
However, the status checks in the timeout loop clobber everything
but the first 4 bits of sstatus, so the errata checks are invalid.

This patch changes it to not clobber SStatus.

Signed-off-by: Andres Salomon <dilinger@debian.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/scsi/sata_mv.c b/drivers/scsi/sata_mv.c
index 1053c7c76b7d..fa38a413d16b 100644
--- a/drivers/scsi/sata_mv.c
+++ b/drivers/scsi/sata_mv.c
@@ -1961,8 +1961,7 @@ comreset_retry:
         timeout = jiffies + msecs_to_jiffies(200);
         do {
                 sata_scr_read(ap, SCR_STATUS, &sstatus);
-                sstatus &= 0x3;
-                if ((sstatus == 3) || (sstatus == 0))
+                if (((sstatus & 0x3) == 3) || ((sstatus & 0x3) == 0))
                         break;
 
                 __msleep(1, can_sleep);