From: Xiyu Yang <xiyuyang19@fudan.edu.cn>
To: Timur Tabi <timur@kernel.org>,
Nicolin Chen <nicoleotsuka@gmail.com>,
Xiubo Li <Xiubo.Lee@gmail.com>,
Fabio Estevam <festevam@gmail.com>,
Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>, Jaroslav Kysela <perex@perex.cz>,
Takashi Iwai <tiwai@suse.com>,
alsa-devel@alsa-project.org, linuxppc-dev@lists.ozlabs.org,
linux-kernel@vger.kernel.org
Cc: yuanxzhang@fudan.edu.cn, kjlu@umn.edu,
Xiyu Yang <xiyuyang19@fudan.edu.cn>,
Xin Tan <tanxin.ctf@gmail.com>
Subject: [PATCH] ASoC: fsl_asrc_dma: Fix dma_chan leak when config DMA channel failed
Date: Mon, 25 May 2020 22:12:46 +0800 [thread overview]
Message-ID: <1590415966-52416-1-git-send-email-xiyuyang19@fudan.edu.cn> (raw)
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>
---
sound/soc/fsl/fsl_asrc_dma.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/sound/soc/fsl/fsl_asrc_dma.c b/sound/soc/fsl/fsl_asrc_dma.c
index e7178817d7a7..1ee10eafe3e6 100644
--- a/sound/soc/fsl/fsl_asrc_dma.c
+++ b/sound/soc/fsl/fsl_asrc_dma.c
@@ -252,6 +252,7 @@ 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;
}
--
2.7.4
next reply other threads:[~2020-05-25 14:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-25 14:12 Xiyu Yang [this message]
2020-05-29 16:51 ` [PATCH] ASoC: fsl_asrc_dma: Fix dma_chan leak when config DMA channel failed Mark Brown
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