[PATCH v2] net: wwan: qcom_bam_dmux: Fix missing pm_runtime_disable()

[PATCH v2] net: wwan: qcom_bam_dmux: Fix missing pm_runtime_disable()

[Jinjie Ruan]

It's important to undo pm_runtime_use_autosuspend() with
pm_runtime_dont_use_autosuspend() at driver exit time.

But the pm_runtime_disable() and pm_runtime_dont_use_autosuspend()
is missing in the error path for bam_dmux_probe(). So add it.

Found by code review. Compile-tested only.

Fixes: 21a0ffd9b38c ("net: wwan: Add Qualcomm BAM-DMUX WWAN network driver")
Suggested-by: Stephan Gerhold <stephan.gerhold@linaro.org>
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
---
v2:
- Drop the unneeded pm_runtime_set_suspended().
- Add Suggested-by.
- Update the commit message.
---
 drivers/net/wwan/qcom_bam_dmux.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wwan/qcom_bam_dmux.c b/drivers/net/wwan/qcom_bam_dmux.c
index 26ca719fa0de..5dcb9a84a12e 100644
--- a/drivers/net/wwan/qcom_bam_dmux.c
+++ b/drivers/net/wwan/qcom_bam_dmux.c
@@ -823,17 +823,17 @@ static int bam_dmux_probe(struct platform_device *pdev)
 	ret = devm_request_threaded_irq(dev, pc_ack_irq, NULL, bam_dmux_pc_ack_irq,
 					IRQF_ONESHOT, NULL, dmux);
 	if (ret)
-		return ret;
+		goto err_disable_pm;
 
 	ret = devm_request_threaded_irq(dev, dmux->pc_irq, NULL, bam_dmux_pc_irq,
 					IRQF_ONESHOT, NULL, dmux);
 	if (ret)
-		return ret;
+		goto err_disable_pm;
 
 	ret = irq_get_irqchip_state(dmux->pc_irq, IRQCHIP_STATE_LINE_LEVEL,
 				    &dmux->pc_state);
 	if (ret)
-		return ret;
+		goto err_disable_pm;
 
 	/* Check if remote finished initialization before us */
 	if (dmux->pc_state) {
@@ -844,6 +844,11 @@ static int bam_dmux_probe(struct platform_device *pdev)
 	}
 
 	return 0;
+
+err_disable_pm:
+	pm_runtime_disable(dev);
+	pm_runtime_dont_use_autosuspend(dev);
+	return ret;
 }
 
 static void bam_dmux_remove(struct platform_device *pdev)
-- 
2.34.1

Re: [PATCH v2] net: wwan: qcom_bam_dmux: Fix missing pm_runtime_disable()

[Stephan Gerhold]

On Mon, Sep 23, 2024 at 07:57:43PM +0800, Jinjie Ruan wrote:
> It's important to undo pm_runtime_use_autosuspend() with
> pm_runtime_dont_use_autosuspend() at driver exit time.
> 
> But the pm_runtime_disable() and pm_runtime_dont_use_autosuspend()
> is missing in the error path for bam_dmux_probe(). So add it.
> 
> Found by code review. Compile-tested only.
> 
> Fixes: 21a0ffd9b38c ("net: wwan: Add Qualcomm BAM-DMUX WWAN network driver")
> Suggested-by: Stephan Gerhold <stephan.gerhold@linaro.org>
> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>

Thanks for making the changes!

Reviewed-by: Stephan Gerhold <stephan.gerhold@linaro.org>

> ---
> v2:
> - Drop the unneeded pm_runtime_set_suspended().
> - Add Suggested-by.
> - Update the commit message.
> ---
>  drivers/net/wwan/qcom_bam_dmux.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/wwan/qcom_bam_dmux.c b/drivers/net/wwan/qcom_bam_dmux.c
> index 26ca719fa0de..5dcb9a84a12e 100644
> --- a/drivers/net/wwan/qcom_bam_dmux.c
> +++ b/drivers/net/wwan/qcom_bam_dmux.c
> @@ -823,17 +823,17 @@ static int bam_dmux_probe(struct platform_device *pdev)
>  	ret = devm_request_threaded_irq(dev, pc_ack_irq, NULL, bam_dmux_pc_ack_irq,
>  					IRQF_ONESHOT, NULL, dmux);
>  	if (ret)
> -		return ret;
> +		goto err_disable_pm;
>  
>  	ret = devm_request_threaded_irq(dev, dmux->pc_irq, NULL, bam_dmux_pc_irq,
>  					IRQF_ONESHOT, NULL, dmux);
>  	if (ret)
> -		return ret;
> +		goto err_disable_pm;
>  
>  	ret = irq_get_irqchip_state(dmux->pc_irq, IRQCHIP_STATE_LINE_LEVEL,
>  				    &dmux->pc_state);
>  	if (ret)
> -		return ret;
> +		goto err_disable_pm;
>  
>  	/* Check if remote finished initialization before us */
>  	if (dmux->pc_state) {
> @@ -844,6 +844,11 @@ static int bam_dmux_probe(struct platform_device *pdev)
>  	}
>  
>  	return 0;
> +
> +err_disable_pm:
> +	pm_runtime_disable(dev);
> +	pm_runtime_dont_use_autosuspend(dev);
> +	return ret;
>  }
>  
>  static void bam_dmux_remove(struct platform_device *pdev)
> -- 
> 2.34.1
> 

Re: [PATCH v2] net: wwan: qcom_bam_dmux: Fix missing pm_runtime_disable()

[Sergey Ryazanov]

On 23.09.2024 14:57, Jinjie Ruan wrote:
> It's important to undo pm_runtime_use_autosuspend() with
> pm_runtime_dont_use_autosuspend() at driver exit time.
> 
> But the pm_runtime_disable() and pm_runtime_dont_use_autosuspend()
> is missing in the error path for bam_dmux_probe(). So add it.
> 
> Found by code review. Compile-tested only.
> 
> Fixes: 21a0ffd9b38c ("net: wwan: Add Qualcomm BAM-DMUX WWAN network driver")
> Suggested-by: Stephan Gerhold <stephan.gerhold@linaro.org>
> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>

Reviewed-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>

Re: [PATCH v2] net: wwan: qcom_bam_dmux: Fix missing pm_runtime_disable()

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller <davem@davemloft.net>:

On Mon, 23 Sep 2024 19:57:43 +0800 you wrote:
> It's important to undo pm_runtime_use_autosuspend() with
> pm_runtime_dont_use_autosuspend() at driver exit time.
> 
> But the pm_runtime_disable() and pm_runtime_dont_use_autosuspend()
> is missing in the error path for bam_dmux_probe(). So add it.
> 
> Found by code review. Compile-tested only.
> 
> [...]

Here is the summary with links:
  - [v2] net: wwan: qcom_bam_dmux: Fix missing pm_runtime_disable()
    https://git.kernel.org/netdev/net/c/d505d3593b52

You are awesome, thank you!
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