[PATCH] ASoC: fsl_asrc: fix second front-end channel check

[Slavin Liu]

Commit b045248399d0 ("ASoC: fsl_asrc: Replace dma_request_slave_channel()
by dma_request_chan()") made ->get_dma_channel() propagate error
pointers, so the !NULL check added by commit b4136c0d69ea ("ASoC:
fsl_asrc: check the second front-end DMA channel") no longer catches
failures and the error pointer would be dereferenced at
tmp_chan->private.

Use IS_ERR() and propagate the error, keeping the release of the
previously acquired persistent Front-End channel.

Fixes: b045248399d0 ("ASoC: fsl_asrc: Replace dma_request_slave_channel() by 
dma_request_chan()")
Assisted-by: LLM
Signed-off-by: Slavin Liu <bolin....@seu.edu.cn>
---
 sound/soc/fsl/fsl_asrc_dma.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/fsl/fsl_asrc_dma.c b/sound/soc/fsl/fsl_asrc_dma.c
index 0aa5db8973d6..097a0d5e8b31 100644
--- a/sound/soc/fsl/fsl_asrc_dma.c
+++ b/sound/soc/fsl/fsl_asrc_dma.c
@@ -251,10 +251,10 @@ static int fsl_asrc_dma_hw_params(struct 
snd_soc_component *component,
 
                /* Get DMA request of Front-End */
                tmp_chan = asrc->get_dma_channel(pair, dir);
-               if (!tmp_chan) {
+               if (IS_ERR(tmp_chan)) {
                        dma_release_channel(pair->dma_chan[!dir]);
                        pair->dma_chan[!dir] = NULL;
-                       return -EINVAL;
+                       return PTR_ERR(tmp_chan);
                }
                tmp_data = tmp_chan->private;
                pair->dma_data.dma_request2 = tmp_data->dma_request;
-- 
2.34.1