Re: MMC layer regression with single-block controllers
From: Pierre Ossman
Date: Tue Mar 24 2009 - 16:01:56 EST
On Mon, 23 Mar 2009 10:28:02 +0100
Manuel Lauss <mano@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
> 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.
>
Ouch. Have you determined that it is the block layer that isn't
respecting its settings? If so, the we probably need to notify Jens
Axboe.
Rgds
--
-- Pierre Ossman
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