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Message-Id: <20251124-dma-coldfire-v1-1-dc8f93185464@yoseli.org> Date: Mon, 24 Nov 2025 13:50:22 +0100 From: Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org> To: Frank Li <Frank.Li@....com>, Vinod Koul <vkoul@...nel.org> Cc: Greg Ungerer <gerg@...ux-m68k.org>, imx@...ts.linux.dev, dmaengine@...r.kernel.org, linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org, Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org> Subject: [PATCH 1/7] dma: fsl-edma: Add write barrier after TCD descriptor fill Add dma_wmb() barrier after filling TCD descriptors to ensure all descriptor writes are visible to the DMA engine before starting transfers. This prevents potential race conditions where the DMA hardware might read partially written descriptors. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org> --- drivers/dma/fsl-edma-common.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c index 4976d7dde08090d16277af4b9f784b9745485320..db36a6aafc910364d75ce6c5d334fd19d2120b6b 100644 --- a/drivers/dma/fsl-edma-common.c +++ b/drivers/dma/fsl-edma-common.c @@ -553,6 +553,9 @@ void fsl_edma_fill_tcd(struct fsl_edma_chan *fsl_chan, fsl_edma_set_tcd_to_le(fsl_chan, tcd, csr, csr); trace_edma_fill_tcd(fsl_chan, tcd); + + /* Ensure descriptor writes are visible to DMA engine */ + dma_wmb(); } static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan *fsl_chan, -- 2.39.5
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