linux-kernel - [PATCH] raid5: panic() on dma_wait_for_async

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Message-id: <201211081106.29980.b.zolnierkie@samsung.com>
Date:	Thu, 08 Nov 2012 11:06:29 +0100
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org
Cc:	Neil Brown <neilb@...e.de>, Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <djbw@...com>, Tomasz Figa <t.figa@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: [PATCH] raid5: panic() on dma_wait_for_async_tx() error

From: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.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@...e.de>
Cc: Vinod Koul <vinod.koul@...el.com>
Cc: Dan Williams <djbw@...com>
Cc: Tomasz Figa <t.figa@...sung.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.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__);
 	}
 }
 
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