MMC layer regression with single-block controllers

[Manuel Lauss]

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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