md: handle writes to broken raid10 arrays gracefully

[karo-tx-linux.git] / drivers / md / raid10.c

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 0c97bf4f686e85158df81c1cfbe54945789226a0..4e53792aa520b8c5fc0aa18df1266dae15d998bf 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -917,6 +917,13 @@ static int make_request(struct request_queue *q, struct bio * bio)
                bio_list_add(&bl, mbio);
        }
 
+       if (unlikely(!atomic_read(&r10_bio->remaining))) {
+               /* the array is dead */
+               md_write_end(mddev);
+               raid_end_bio_io(r10_bio);
+               return 0;
+       }
+
        bitmap_startwrite(mddev->bitmap, bio->bi_sector, r10_bio->sectors, 0);
        spin_lock_irqsave(&conf->device_lock, flags);
        bio_list_merge(&conf->pending_bio_list, &bl);