Re: [PATCH] mmc: sdhci: fix dma memory leak in sdhci_pre_req()

[Jiri Slaby]

On 08/07/2015, 11:29 AM, Haibo Chen wrote:
> Currently one mrq->data maybe execute dma_map_sg() twice
> when mmc subsystem prepare over one new request, and the
> following log show up:
> 	sdhci[sdhci_pre_dma_transfer] invalid cookie: 24, next-cookie 25
> 
> In this condition, mrq->date map a dma-memory(1) in sdhci_pre_req
> for the first time, and map another dma-memory(2) in sdhci_prepare_data
> for the second time. But driver only unmap the dma-memory(2), and
> dma-memory(1) never unmapped, which cause the dma memory leak issue.
> 
> This patch use another method to map the dma memory for the mrq->data
> which can fix this dma memory leak issue.
> 
> Fixes: commit 348487cb28e66b0 ("mmc: sdhci: use pipeline mmc requests to improve performance")
> Cc: stable@xxxxxxxxxxxxxxx # 4.0+
> Reported-by: Jiri Slaby <jslaby@xxxxxxx>

Reported-and-tested-by: Jiri Slaby <jslaby@xxxxxxx>

I also added the mentioned WARN_ON in place and it never triggerred. (As
I expected...)

Thanks!

-- 
js
suse labs
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/