linux-kernel - MMC layer regression with single-block controllers

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Message-ID: <20090323092802.GA30122@roarinelk.homelinux.net>
Date:	Mon, 23 Mar 2009 10:28:02 +0100
From:	Manuel Lauss <mano@...rinelk.homelinux.net>
To:	Pierre Ossman <drzeus@...eus.cx>
Cc:	linux-kernel@...r.kernel.org
Subject: MMC layer regression with single-block controllers

Hello Pierre,

Since about 2.6.28-rc1, I hit the following BUG_ON() in mmc/core.c
(line 155):

        if (mrq->data) {
                BUG_ON(mrq->data->blksz > host->max_blk_size);
>>>>>>>>>       BUG_ON(mrq->data->blocks > host->max_blk_count);  <<<<<<
                BUG_ON(mrq->data->blocks * mrq->data->blksz >
                        host->max_req_size);

It's easy to reproduce; just set your favorite host controllers'
mmc->max_blk_cnt to 1 (or anything smaller than 4).  As far as I can
tell it was introduced with some block layer changes before 2.6.28-rc1
was released.

Thanks,
	Manuel Lauss
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