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From:   Alain Volmat <alain.volmat@st.com>
To:     <wsa@kernel.org>, <pierre-yves.mordret@st.com>
CC:     <alexandre.torgue@st.com>, <linux-i2c@vger.kernel.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <fabrice.gasnier@st.com>,
        <krzk@kernel.org>, <h.assmann@pengutronix.de>,
        <alain.volmat@st.com>
Subject: [PATCH v2 2/2] i2c: stm32: Simplify with dev_err_probe()
Date:   Mon, 14 Sep 2020 12:40:34 +0200
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From: Krzysztof Kozlowski <krzk@kernel.org>

Common pattern of handling deferred probe can be simplified with
dev_err_probe().  Less code and the error value gets printed.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Alain Volmat <alain.volmat@st.com>
---
v2: rebased on top of patch [i2c: stm32: fix error message on upon
dma_request_chan & defer handling]
---
 drivers/i2c/busses/i2c-stm32.c   | 10 ++++++----
 drivers/i2c/busses/i2c-stm32f4.c |  6 ++----
 drivers/i2c/busses/i2c-stm32f7.c | 14 +++++---------
 3 files changed, 13 insertions(+), 17 deletions(-)

diff --git a/drivers/i2c/busses/i2c-stm32.c b/drivers/i2c/busses/i2c-stm32.c
index 468620db9ea5..157c64e27d0b 100644
--- a/drivers/i2c/busses/i2c-stm32.c
+++ b/drivers/i2c/busses/i2c-stm32.c
@@ -26,8 +26,9 @@ struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev,
 	dma->chan_tx = dma_request_chan(dev, "tx");
 	if (IS_ERR(dma->chan_tx)) {
 		ret = PTR_ERR(dma->chan_tx);
-		if ((ret != -ENODEV) && (ret != -EPROBE_DEFER))
-			dev_err(dev, "can't request DMA tx channel\n");
+		if (ret != -ENODEV)
+			ret = dev_err_probe(dev, ret,
+					    "can't request DMA tx channel\n");
 		goto fail_al;
 	}
 
@@ -46,8 +47,9 @@ struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev,
 	dma->chan_rx = dma_request_chan(dev, "rx");
 	if (IS_ERR(dma->chan_rx)) {
 		ret = PTR_ERR(dma->chan_rx);
-		if ((ret != -ENODEV) && (ret != -EPROBE_DEFER))
-			dev_err(dev, "can't request DMA rx channel\n");
+		if (ret != -ENODEV)
+			ret = dev_err_probe(dev, ret,
+					    "can't request DMA rx channel\n");
 
 		goto fail_tx;
 	}
diff --git a/drivers/i2c/busses/i2c-stm32f4.c b/drivers/i2c/busses/i2c-stm32f4.c
index 48e269284369..937c2c8fd349 100644
--- a/drivers/i2c/busses/i2c-stm32f4.c
+++ b/drivers/i2c/busses/i2c-stm32f4.c
@@ -797,10 +797,8 @@ static int stm32f4_i2c_probe(struct platform_device *pdev)
 
 	rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
 	if (IS_ERR(rst)) {
-		ret = PTR_ERR(rst);
-		if (ret != -EPROBE_DEFER)
-			dev_err(&pdev->dev, "Error: Missing reset ctrl\n");
-
+		ret = dev_err_probe(&pdev->dev, PTR_ERR(rst),
+				    "Error: Missing reset ctrl\n");
 		goto clk_free;
 	}
 	reset_control_assert(rst);
diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index 8a61320a9cb9..0fbd964c2fe8 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -1968,11 +1968,9 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
 						    "wakeup-source");
 
 	i2c_dev->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(i2c_dev->clk)) {
-		if (PTR_ERR(i2c_dev->clk) != -EPROBE_DEFER)
-			dev_err(&pdev->dev, "Failed to get controller clock\n");
-		return PTR_ERR(i2c_dev->clk);
-	}
+	if (IS_ERR(i2c_dev->clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(i2c_dev->clk),
+				     "Failed to get controller clock\n");
 
 	ret = clk_prepare_enable(i2c_dev->clk);
 	if (ret) {
@@ -1982,10 +1980,8 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
 
 	rst = devm_reset_control_get(&pdev->dev, NULL);
 	if (IS_ERR(rst)) {
-		ret = PTR_ERR(rst);
-		if (ret != -EPROBE_DEFER)
-			dev_err(&pdev->dev, "Error: Missing reset ctrl\n");
-
+		ret = dev_err_probe(&pdev->dev, PTR_ERR(rst),
+				    "Error: Missing reset ctrl\n");
 		goto clk_free;
 	}
 	reset_control_assert(rst);
-- 
2.7.4