xen/blkback: Check for proper operation.

The patch titled: "xen/blkback: Fix the inhibition to map pages
when discarding sector ranges." had the right idea except that
it used the wrong comparison operator. It had == instead of !=.

This fixes the bug where all (except discard) operations would
have been ignored.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 53c81de6f886..a1ee2659d2bc 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -707,7 +707,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
          * the hypercall to unmap the grants - that is all done in
          * xen_blkbk_unmap.
          */
-        if (operation == REQ_DISCARD && xen_blkbk_map(req, pending_req, seg))
+        if (operation != REQ_DISCARD && xen_blkbk_map(req, pending_req, seg))
                 goto fail_flush;
 
         /*