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-rw-r--r--fs/buffer.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/buffer.c b/fs/buffer.c
index 061dd202979d..d468ed9981e0 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -3157,6 +3157,15 @@ int __sync_dirty_buffer(struct buffer_head *bh, int op_flags)
WARN_ON(atomic_read(&bh->b_count) < 1);
lock_buffer(bh);
if (test_clear_buffer_dirty(bh)) {
+ /*
+ * The bh should be mapped, but it might not be if the
+ * device was hot-removed. Not much we can do but fail the I/O.
+ */
+ if (!buffer_mapped(bh)) {
+ unlock_buffer(bh);
+ return -EIO;
+ }
+
get_bh(bh);
bh->b_end_io = end_buffer_write_sync;
ret = submit_bh(REQ_OP_WRITE, op_flags, bh);