linux-kernel - [PATCH v4 1/3] i2c: stm32: fix the device used for the DMA map

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Message-ID: <20250704-i2c-upstream-v4-1-84a095a2c728@foss.st.com>
Date: Fri, 4 Jul 2025 10:39:14 +0200
From: Clément Le Goffic <clement.legoffic@...s.st.com>
To: Pierre-Yves MORDRET <pierre-yves.mordret@...s.st.com>,
        Alain Volmat
	<alain.volmat@...s.st.com>,
        Andi Shyti <andi.shyti@...nel.org>,
        "Maxime
 Coquelin" <mcoquelin.stm32@...il.com>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        "M'boumba Cedric
 Madianga" <cedric.madianga@...il.com>,
        Wolfram Sang <wsa@...nel.org>
CC: Pierre-Yves MORDRET <pierre-yves.mordret@...com>,
        <linux-i2c@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-media@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <linaro-mm-sig@...ts.linaro.org>,
        Clément Le Goffic
	<clement.legoffic@...s.st.com>
Subject: [PATCH v4 1/3] i2c: stm32: fix the device used for the DMA map

If the DMA mapping failed, it produced an error log with the wrong
device name:
"stm32-dma3 40400000.dma-controller: rejecting DMA map of vmalloc memory"
Fix this issue by replacing the dev with the I2C dev.

Fixes: bb8822cbbc53 ("i2c: i2c-stm32: Add generic DMA API")
Acked-by: Alain Volmat <alain.volmat@...s.st.com>
Signed-off-by: Clément Le Goffic <clement.legoffic@...s.st.com>
---
 drivers/i2c/busses/i2c-stm32.c   | 8 +++-----
 drivers/i2c/busses/i2c-stm32f7.c | 4 ++--
 2 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-stm32.c b/drivers/i2c/busses/i2c-stm32.c
index 157c64e27d0b..f84ec056e36d 100644
--- a/drivers/i2c/busses/i2c-stm32.c
+++ b/drivers/i2c/busses/i2c-stm32.c
@@ -102,7 +102,6 @@ int stm32_i2c_prep_dma_xfer(struct device *dev, struct stm32_i2c_dma *dma,
 			    void *dma_async_param)
 {
 	struct dma_async_tx_descriptor *txdesc;
-	struct device *chan_dev;
 	int ret;
 
 	if (rd_wr) {
@@ -116,11 +115,10 @@ int stm32_i2c_prep_dma_xfer(struct device *dev, struct stm32_i2c_dma *dma,
 	}
 
 	dma->dma_len = len;
-	chan_dev = dma->chan_using->device->dev;
 
-	dma->dma_buf = dma_map_single(chan_dev, buf, dma->dma_len,
+	dma->dma_buf = dma_map_single(dev, buf, dma->dma_len,
 				      dma->dma_data_dir);
-	if (dma_mapping_error(chan_dev, dma->dma_buf)) {
+	if (dma_mapping_error(dev, dma->dma_buf)) {
 		dev_err(dev, "DMA mapping failed\n");
 		return -EINVAL;
 	}
@@ -150,7 +148,7 @@ int stm32_i2c_prep_dma_xfer(struct device *dev, struct stm32_i2c_dma *dma,
 	return 0;
 
 err:
-	dma_unmap_single(chan_dev, dma->dma_buf, dma->dma_len,
+	dma_unmap_single(dev, dma->dma_buf, dma->dma_len,
 			 dma->dma_data_dir);
 	return ret;
 }
diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index e4aaeb2262d0..817d081460c2 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -741,10 +741,10 @@ static void stm32f7_i2c_dma_callback(void *arg)
 {
 	struct stm32f7_i2c_dev *i2c_dev = (struct stm32f7_i2c_dev *)arg;
 	struct stm32_i2c_dma *dma = i2c_dev->dma;
-	struct device *dev = dma->chan_using->device->dev;
 
 	stm32f7_i2c_disable_dma_req(i2c_dev);
-	dma_unmap_single(dev, dma->dma_buf, dma->dma_len, dma->dma_data_dir);
+	dma_unmap_single(i2c_dev->dev, dma->dma_buf, dma->dma_len,
+			 dma->dma_data_dir);
 	complete(&dma->dma_complete);
 }
 

-- 
2.43.0