diff options
| author | Takashi Iwai <tiwai@suse.de> | 2021-06-11 13:19:48 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2021-06-29 17:50:00 +0300 |
| commit | 49036ba889e346da6ebf2f741fe0b0ee49a11b08 (patch) | |
| tree | 5bbb5650dfb9131d256a68febe451be415284d1d /drivers/mmc/host | |
| parent | 2f2b73a29d2aabf5ad0150856c3e5cb6e04dcfc1 (diff) | |
| download | linux-49036ba889e346da6ebf2f741fe0b0ee49a11b08.tar.xz | |
mmc: sdhci: Clear unused bounce buffer at DMA mmap error path
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>
Diffstat (limited to 'drivers/mmc/host')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 6aaf5c3ce34c..cf01b6f94d7f 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -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 */ |