S3C6410 SDHCI driver crash
Ben Dooks
ben-linux at fluff.org
Thu Sep 24 15:00:02 EDT 2009
On Thu, Sep 24, 2009 at 05:32:37PM +0200, Maurus Cuelenaere wrote:
> Hi,
>
> I'm currently experiencing an SDHCI bug in 2.6.31 and linux-next, which
> didn't
> seem to appear in 2.6.31-rc8.
>
> This is on a new S3C6410 platform (SmartQ 7, see [1]) and it seems to be
> consistently happening right after displaying "Loading hardware drivers" (in
> user-space; Ubuntu-based).
>
> The relevant kernel log lines are:
>
> blk: request botched
> kernel BUG at drivers/mmc/host/sdhci.c:298!
Having a look at the code in mainline, this is being triggered in
sdhci_write_block_pio(), by the following code:
296 while (blksize) {
297 if (!sg_miter_next(&host->sg_miter))
298 BUG();
Which suggests that the size of the transfer was bigger than the sg list
passed to the transfer, which is worrying as this seems to suggest there
is a problem with the PIO code writing insufficient data to the card.
--
Ben
Q: What's a light-year?
A: One-third less calories than a regular year.
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