mmc: sdhci: Clear unused bounce buffer at DMA mmap error path

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When DMA-mapping of the bounce buffer fails, the driver tries to fall
back, but it leaves the allocated host->bounce_buffer although its
size is zero.  Later on, the driver checks the use of bounce buffer
with host->bounce_buffer pointer, and it tries to use the buffer
incorrectly, resulting in Oops.

This patch clears the release the unused buffer and clears the
bounce_buffer pointer for addressing the problem.

Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20210611101948.18972-1-tiwai@suse.de
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

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Takashi Iwai 2021-06-11 12:19:48 +02:00 • committed by Ulf Hansson

parent 2f2b73a29d

commit 49036ba889

1 changed files with 5 additions and 1 deletions

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drivers/mmc/host/sdhci.c

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