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| author | Xiyu Yang <xiyuyang19@fudan.edu.cn> | 2020-05-25 22:12:46 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-05-29 13:30:07 +0100 |
| commit | 36124fb19f1ae68a500cd76a76d40c6e81bee346 (patch) | |
| tree | a780a7e88a34e65dfec1fb1a0d993b67680f64f3 | |
| parent | 2aec8ccc1a814ca41b70710e1960afd034d1e3ab (diff) | |
| download | linux-36124fb19f1ae68a500cd76a76d40c6e81bee346.tar.bz2 | |
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>
| -rw-r--r-- | sound/soc/fsl/fsl_asrc_dma.c | 1 |
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; } |