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

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Message-ID: <20121108111526.40c705a0@pyramind.ukuu.org.uk>
Date:	Thu, 8 Nov 2012 11:15:26 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	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: Re: [PATCH] raid5: panic() on dma_wait_for_async_tx() error

On Thu, 08 Nov 2012 11:06:29 +0100
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com> wrote:

> 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__);

Thats a really horrible place to panic.

Alan
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