[SCSI] Return ENODATA on medium error

When a medium error is detected the SCSI stack should return
ENODATA to the upper layers.

[jejb: fix whitespace error]
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 5adede17ddf6..b759a127f9c3 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1261,6 +1261,20 @@ static void activate_path(struct work_struct *work)
                                 pg_init_done, pgpath);
 }
 
+static int noretry_error(int error)
+{
+        switch (error) {
+        case -EOPNOTSUPP:
+        case -EREMOTEIO:
+        case -EILSEQ:
+        case -ENODATA:
+                return 1;
+        }
+
+        /* Anything else could be a path failure, so should be retried */
+        return 0;
+}
+
 /*
  * end_io handling
  */
@@ -1284,7 +1298,7 @@ static int do_end_io(struct multipath *m, struct request *clone,
         if (!error && !clone->errors)
                 return 0;       /* I/O complete */
 
-        if (error == -EOPNOTSUPP || error == -EREMOTEIO || error == -EILSEQ)
+        if (noretry_error(error))
                 return error;
 
         if (mpio->pgpath)