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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>
This commit is contained in:
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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6
drivers/mmc/host/sdhci.c
View file

@ -4072,9 +4072,13 @@ static void sdhci_allocate_bounce_buffer(struct sdhci_host *host)
bounce_size,
DMA_BIDIRECTIONAL);
ret = dma_mapping_error(mmc_dev(mmc), host->bounce_addr);
if (ret)
if (ret) {
devm_kfree(mmc_dev(mmc), host->bounce_buffer);
host->bounce_buffer = NULL;
/* Again fall back to max_segs == 1 */
return;
}
host->bounce_buffer_size = bounce_size;
/* Lie about this since we're bouncing */