mmc: sdhci: fix dma memory leak in sdhci_pre_req()

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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: 348487cb28 ("mmc: sdhci: use pipeline mmc requests to improve performance")
Reported-and-tested-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Haibo Chen <haibo.chen@freescale.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

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This commit is contained in:

Haibo Chen 2015-08-25 10:02:11 +08:00 • committed by Ulf Hansson

parent 90614cd904

commit d31911b937

2 changed files with 29 additions and 46 deletions

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67

drivers/mmc/host/sdhci.c

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8

drivers/mmc/host/sdhci.h

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