1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 3db3d1b271f7..1e634a68541e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -307,6 +307,10 @@ static void md_make_request(struct request_queue *q, struct bio *bio)
                 bio_io_error(bio);
                 return;
         }
+        if (mddev->ro == 1 && unlikely(rw == WRITE)) {
+                bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS);
+                return;
+        }
         smp_rmb(); /* Ensure implications of  'active' are visible */
         rcu_read_lock();
         if (mddev->suspended) {