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charset="utf-8" Introduce a scope guard to automatically unlock the mutex within fsl_edma3_xlate() to simplify the code. Prepare to add source ID checks in the future. Signed-off-by: Joy Zou Reviewed-by: Frank Li --- drivers/dma/fsl-edma-main.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/drivers/dma/fsl-edma-main.c b/drivers/dma/fsl-edma-main.c index c66185c5a199..d4f29ece69f5 100644 --- a/drivers/dma/fsl-edma-main.c +++ b/drivers/dma/fsl-edma-main.c @@ -153,7 +153,7 @@ static struct dma_chan *fsl_edma3_xlate(struct of_phand= le_args *dma_spec, =20 b_chmux =3D !!(fsl_edma->drvdata->flags & FSL_EDMA_DRV_HAS_CHMUX); =20 - mutex_lock(&fsl_edma->fsl_edma_mutex); + guard(mutex)(&fsl_edma->fsl_edma_mutex); list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) { =20 @@ -177,18 +177,15 @@ static struct dma_chan *fsl_edma3_xlate(struct of_pha= ndle_args *dma_spec, if (!b_chmux && i =3D=3D dma_spec->args[0]) { chan =3D dma_get_slave_channel(chan); chan->device->privatecnt++; - mutex_unlock(&fsl_edma->fsl_edma_mutex); return chan; } else if (b_chmux && !fsl_chan->srcid) { /* if controller support channel mux, choose a free channel */ chan =3D dma_get_slave_channel(chan); chan->device->privatecnt++; fsl_chan->srcid =3D dma_spec->args[0]; - mutex_unlock(&fsl_edma->fsl_edma_mutex); return chan; } } - mutex_unlock(&fsl_edma->fsl_edma_mutex); return NULL; } =20 --=20 2.37.1