linux-kernel - [PATCH 1/2] dmaengine: Add cleanup FREE defines for dma_async_tx

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Message-Id: <20251002-dma_chan_free-v1-1-4dbf116c2b19@nxp.com>
Date: Thu, 02 Oct 2025 15:49:41 -0400
From: Frank Li <Frank.Li@....com>
To: Vinod Koul <vkoul@...nel.org>, Dong Aisheng <aisheng.dong@....com>, 
 Andi Shyti <andi.shyti@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>
Cc: dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-i2c@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, carlos.song@....com, 
 Frank Li <Frank.Li@....com>
Subject: [PATCH 1/2] dmaengine: Add cleanup FREE defines for
 dma_async_tx_descriptor

Add cleanup FREE defines for dma_async_tx_descriptor to support automatic
cleanup and simplify error handling.

Signed-off-by: Frank Li <Frank.Li@....com>
---
Check patch report exceed 100 chars, but it's still better put into one
line to keep consistent with other DEFINE_FREE and better readablity
---
 include/linux/dmaengine.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 99efe2b9b4ea9844ca6161208362ef18ef111d96..7826b40727ab889c9167343bf15628b83b85647c 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -5,6 +5,7 @@
 #ifndef LINUX_DMAENGINE_H
 #define LINUX_DMAENGINE_H
 
+#include <linux/cleanup.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/uio.h>
@@ -1525,7 +1526,6 @@ struct dma_chan *__dma_request_channel(const dma_cap_mask_t *mask,
 struct dma_chan *dma_request_chan(struct device *dev, const char *name);
 struct dma_chan *dma_request_chan_by_mask(const dma_cap_mask_t *mask);
 struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name);
-
 void dma_release_channel(struct dma_chan *chan);
 int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps);
 #else
@@ -1612,6 +1612,8 @@ static inline int dmaengine_desc_free(struct dma_async_tx_descriptor *desc)
 	return desc->desc_free(desc);
 }
 
+DEFINE_FREE(dma_async_tx_descriptor, struct dma_async_tx_descriptor *, if (_T) dmaengine_desc_free(_T))
+
 /* --- DMA device --- */
 
 int dma_async_device_register(struct dma_device *device);

-- 
2.34.1