[PATCH] raid5: panic() on dma_wait_for_async_tx() error

[Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>]

From: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Subject: [PATCH] raid5: panic() on dma_wait_for_async_tx() error

There is not much we can do on dma_wait_for_async_tx() error
so just panic() for now.

Cc: Neil Brown <neilb@suse.de>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <djbw@fb.com>
Cc: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 drivers/md/raid5.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: b/drivers/md/raid5.c
===================================================================
--- a/drivers/md/raid5.c	2012-11-07 16:25:19.480876012 +0100
+++ b/drivers/md/raid5.c	2012-11-07 16:27:46.244875992 +0100
@@ -3223,7 +3223,9 @@ static void handle_stripe_expansion(stru
 	/* done submitting copies, wait for them to complete */
 	if (tx) {
 		async_tx_ack(tx);
-		dma_wait_for_async_tx(tx);
+		if (dma_wait_for_async_tx(tx) != DMA_SUCCESS)
+			panic("%s: DMA error waiting for transaction\n",
+			      __func__);
 	}
 }