From: Andrew Morton <akpm@osdl.org>

size_t is unsigned.  IO errors aren't getting through.

Cc: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 fs/block_dev.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN fs/block_dev.c~blockdev-direct_io-fix-signedness-bug fs/block_dev.c
--- a/fs/block_dev.c~blockdev-direct_io-fix-signedness-bug
+++ a/fs/block_dev.c
@@ -146,7 +146,7 @@ static int blk_end_aio(struct bio *bio, 
 		iocb->ki_nbytes = -EIO;
 
 	if (atomic_dec_and_test(bio_count)) {
-		if (iocb->ki_nbytes < 0)
+		if ((long)iocb->ki_nbytes < 0)
 			aio_complete(iocb, iocb->ki_nbytes, 0);
 		else
 			aio_complete(iocb, iocb->ki_left, 0);
_