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authorXiyu Yang <xiyuyang19@fudan.edu.cn>2020-05-25 22:12:46 +0800
committerMark Brown <broonie@kernel.org>2020-05-29 13:30:07 +0100
commit36124fb19f1ae68a500cd76a76d40c6e81bee346 (patch)
treea780a7e88a34e65dfec1fb1a0d993b67680f64f3 /sound
parent2aec8ccc1a814ca41b70710e1960afd034d1e3ab (diff)
ASoC: fsl_asrc_dma: Fix dma_chan leak when config DMA channel failed
fsl_asrc_dma_hw_params() invokes dma_request_channel() or fsl_asrc_get_dma_channel(), which returns a reference of the specified dma_chan object to "pair->dma_chan[dir]" with increased refcnt. The reference counting issue happens in one exception handling path of fsl_asrc_dma_hw_params(). When config DMA channel failed for Back-End, the function forgets to decrease the refcnt increased by dma_request_channel() or fsl_asrc_get_dma_channel(), causing a refcnt leak. Fix this issue by calling dma_release_channel() when config DMA channel failed. Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn> Signed-off-by: Xin Tan <tanxin.ctf@gmail.com> Link: https://lore.kernel.org/r/1590415966-52416-1-git-send-email-xiyuyang19@fudan.edu.cn Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/fsl/fsl_asrc_dma.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/soc/fsl/fsl_asrc_dma.c b/sound/soc/fsl/fsl_asrc_dma.c
index e5d1b218acf8..d6a3fc5f87e5 100644
--- a/sound/soc/fsl/fsl_asrc_dma.c
+++ b/sound/soc/fsl/fsl_asrc_dma.c
@@ -261,6 +261,7 @@ static int fsl_asrc_dma_hw_params(struct snd_soc_component *component,
ret = dmaengine_slave_config(pair->dma_chan[dir], &config_be);
if (ret) {
dev_err(dev, "failed to config DMA channel for Back-End\n");
+ dma_release_channel(pair->dma_chan[dir]);
return ret;
}