linux-kernel - Re: [PATCH 1/1] dmaengine: fsl-edma: fix all channels requested when call fsl_edma3

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Message-ID: <ZRWLSkl/QzBtls+T@lizhi-Precision-Tower-5810>
Date:   Thu, 28 Sep 2023 10:18:50 -0400
From:   Frank Li <Frank.li@....com>
To:     Vinod Koul <vkoul@...nel.org>,
        "open list:FREESCALE eDMA DRIVER" <imx@...ts.linux.dev>,
        "open list:FREESCALE eDMA DRIVER" <dmaengine@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] dmaengine: fsl-edma: fix all channels requested when
 call fsl_edma3_xlate()

On Thu, Sep 14, 2023 at 06:22:04PM -0400, Frank Li wrote:
> dma_get_slave_channel() increases client_count for all channels. It should
> only be called when a matched channel is found in fsl_edma3_xlate().
> 
> Move dma_get_slave_channel() after checking for a matched channel.

@Vinod
	ping

Frank

> 
> Cc: <stable@...r.kernel.org>
> Fixes: 72f5801a4e2b ("dmaengine: fsl-edma: integrate v3 support")
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>  drivers/dma/fsl-edma-main.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dma/fsl-edma-main.c b/drivers/dma/fsl-edma-main.c
> index 029a72872821d..2c20460e53aa9 100644
> --- a/drivers/dma/fsl-edma-main.c
> +++ b/drivers/dma/fsl-edma-main.c
> @@ -154,18 +154,20 @@ static struct dma_chan *fsl_edma3_xlate(struct of_phandle_args *dma_spec,
>  		fsl_chan = to_fsl_edma_chan(chan);
>  		i = fsl_chan - fsl_edma->chans;
>  
> -		chan = dma_get_slave_channel(chan);
> -		chan->device->privatecnt++;
>  		fsl_chan->priority = dma_spec->args[1];
>  		fsl_chan->is_rxchan = dma_spec->args[2] & ARGS_RX;
>  		fsl_chan->is_remote = dma_spec->args[2] & ARGS_REMOTE;
>  		fsl_chan->is_multi_fifo = dma_spec->args[2] & ARGS_MULTI_FIFO;
>  
>  		if (!b_chmux && i == dma_spec->args[0]) {
> +			chan = 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 = dma_get_slave_channel(chan);
> +			chan->device->privatecnt++;
>  			fsl_chan->srcid = dma_spec->args[0];
>  			mutex_unlock(&fsl_edma->fsl_edma_mutex);
>  			return chan;
> -- 
> 2.34.1
>