[PATCH] i2c: i2c-stm32f7: fix & reorder remove & probe error handling

[PATCH] i2c: i2c-stm32f7: fix & reorder remove & probe error handling

[Alain Volmat]

Add missing dma channels free calls in case of error during probe
and reorder the remove function so that dma channels are freed after
the i2c adapter is deleted.
Overall, reorder the remove function so that probe error handling order
and remove function order are same.

Fixes: 7ecc8cfde553 ("i2c: i2c-stm32f7: Add DMA support")

Signed-off-by: Alain Volmat <alain.volmat@st.com>
---
 drivers/i2c/busses/i2c-stm32f7.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index d36cf08461f7..f8ef203dabfc 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -1980,6 +1980,11 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
 	pm_runtime_set_suspended(i2c_dev->dev);
 	pm_runtime_dont_use_autosuspend(i2c_dev->dev);
 
+	if (i2c_dev->dma) {
+		stm32_i2c_dma_free(i2c_dev->dma);
+		i2c_dev->dma = NULL;
+	}
+
 clk_free:
 	clk_disable_unprepare(i2c_dev->clk);
 
@@ -1990,21 +1995,21 @@ static int stm32f7_i2c_remove(struct platform_device *pdev)
 {
 	struct stm32f7_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
 
-	if (i2c_dev->dma) {
-		stm32_i2c_dma_free(i2c_dev->dma);
-		i2c_dev->dma = NULL;
-	}
-
 	i2c_del_adapter(&i2c_dev->adap);
 	pm_runtime_get_sync(i2c_dev->dev);
 
-	clk_disable_unprepare(i2c_dev->clk);
-
 	pm_runtime_put_noidle(i2c_dev->dev);
 	pm_runtime_disable(i2c_dev->dev);
 	pm_runtime_set_suspended(i2c_dev->dev);
 	pm_runtime_dont_use_autosuspend(i2c_dev->dev);
 
+	if (i2c_dev->dma) {
+		stm32_i2c_dma_free(i2c_dev->dma);
+		i2c_dev->dma = NULL;
+	}
+
+	clk_disable_unprepare(i2c_dev->clk);
+
 	return 0;
 }
 
-- 
2.7.4

Re: [PATCH] i2c: i2c-stm32f7: fix & reorder remove & probe error handling

[Pierre Yves MORDRET]

Hi

Look good for me

Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>

Thanks

On 10/25/19 4:04 PM, Alain Volmat wrote:
> Add missing dma channels free calls in case of error during probe
> and reorder the remove function so that dma channels are freed after
> the i2c adapter is deleted.
> Overall, reorder the remove function so that probe error handling order
> and remove function order are same.
> 
> Fixes: 7ecc8cfde553 ("i2c: i2c-stm32f7: Add DMA support")
> 
> Signed-off-by: Alain Volmat <alain.volmat@st.com>
> ---
>  drivers/i2c/busses/i2c-stm32f7.c | 19 ++++++++++++-------
>  1 file changed, 12 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
> index d36cf08461f7..f8ef203dabfc 100644
> --- a/drivers/i2c/busses/i2c-stm32f7.c
> +++ b/drivers/i2c/busses/i2c-stm32f7.c
> @@ -1980,6 +1980,11 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
>  	pm_runtime_set_suspended(i2c_dev->dev);
>  	pm_runtime_dont_use_autosuspend(i2c_dev->dev);
>  
> +	if (i2c_dev->dma) {
> +		stm32_i2c_dma_free(i2c_dev->dma);
> +		i2c_dev->dma = NULL;
> +	}
> +
>  clk_free:
>  	clk_disable_unprepare(i2c_dev->clk);
>  
> @@ -1990,21 +1995,21 @@ static int stm32f7_i2c_remove(struct platform_device *pdev)
>  {
>  	struct stm32f7_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
>  
> -	if (i2c_dev->dma) {
> -		stm32_i2c_dma_free(i2c_dev->dma);
> -		i2c_dev->dma = NULL;
> -	}
> -
>  	i2c_del_adapter(&i2c_dev->adap);
>  	pm_runtime_get_sync(i2c_dev->dev);
>  
> -	clk_disable_unprepare(i2c_dev->clk);
> -
>  	pm_runtime_put_noidle(i2c_dev->dev);
>  	pm_runtime_disable(i2c_dev->dev);
>  	pm_runtime_set_suspended(i2c_dev->dev);
>  	pm_runtime_dont_use_autosuspend(i2c_dev->dev);
>  
> +	if (i2c_dev->dma) {
> +		stm32_i2c_dma_free(i2c_dev->dma);
> +		i2c_dev->dma = NULL;
> +	}
> +
> +	clk_disable_unprepare(i2c_dev->clk);
> +
>  	return 0;
>  }
>  
> 

Re: [PATCH] i2c: i2c-stm32f7: fix & reorder remove & probe error handling

[Wolfram Sang]

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On Fri, Oct 25, 2019 at 04:04:24PM +0200, Alain Volmat wrote:
> Add missing dma channels free calls in case of error during probe
> and reorder the remove function so that dma channels are freed after
> the i2c adapter is deleted.
> Overall, reorder the remove function so that probe error handling order
> and remove function order are same.
> 
> Fixes: 7ecc8cfde553 ("i2c: i2c-stm32f7: Add DMA support")
> 
> Signed-off-by: Alain Volmat <alain.volmat@st.com>

Applied to for-next, thanks!


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