linux-kernel - Re: [PATCH 2/2] mmc_block: ensure all sectors that do not have errors are read

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Date:	Sun, 21 Dec 2008 15:29:15 +0100
From:	Pierre Ossman <drzeus@...eus.cx>
To:	Adrian Hunter <ext-adrian.hunter@...ia.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] mmc_block: ensure all sectors that do not have
 errors are read

On Fri, 05 Dec 2008 13:09:11 +0200
Adrian Hunter <ext-adrian.hunter@...ia.com> wrote:

> @@ -281,6 +289,16 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
>  		brq.data.sg = mq->sg;
>  		brq.data.sg_len = mmc_queue_map_sg(mq);
>  
> +		/*
> +		 * Some drivers expect the sg list to be the same size as the
> +		 * request, which it won't be if we have fallen back to do
> +		 * one sector at a time.
> +		 */
> +		if (disable_multi) {
> +			brq.data.sg->length = 512;
> +			brq.data.sg_len = 1;
> +		}
> +
>  		mmc_queue_bounce_pre(mq);
>  
>  		mmc_wait_for_req(card->host, &brq.mrq);

Unfortunately, there is no guarantee that the sg list will be sector
aligned. Look at the code removed in f3eb0aaa02 for how to handle this
properly.

Other than that, the patch looks ready to go.

Rgds
-- 
     -- Pierre Ossman

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