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

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Message-Id: <20231004142911.838916-1-Frank.Li@nxp.com>
Date:   Wed,  4 Oct 2023 10:29:11 -0400
From:   Frank Li <Frank.Li@....com>
To:     vkoul@...nel.org
Cc:     Frank.li@....com, dmaengine@...r.kernel.org, imx@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH resent 1/1] dmaengine: fsl-edma: fix all channels requested when call fsl_edma3_xlate()

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.

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 58ad148a74bb..4f8312b64f14 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