block: handle ENOTSUP from discard in generic code

Similar to write_zeroes, let the generic code receive a ENOTSUP for
discard operations.  Since bdrv_discard has advisory semantics,
we can just swallow the error.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/block.c b/block.c
index c491edf..9818052 100644
--- a/block.c
+++ b/block.c
@@ -4376,7 +4376,7 @@ int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num,
                 ret = co.ret;
             }
         }
-        if (ret) {
+        if (ret && ret != -ENOTSUP) {
             return ret;
         }