[PATCH] memory: exynos5422-dmc: handle clock enable failures

[PATCH] memory: exynos5422-dmc: handle clock enable failures

[Jiawen Liu]

Check clock-enable failures during probe.

If a later clock cannot be enabled, unwind clocks already enabled on
that path before returning the error.

Signed-off-by: jiawen <1298662399@qq.com>
---
diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
--- a/drivers/memory/samsung/exynos5422-dmc.c
+++ b/drivers/memory/samsung/exynos5422-dmc.c
@@ -1297,8 +1297,15 @@
 	if (ret)
 		return ret;
 
-	clk_prepare_enable(dmc->fout_bpll);
-	clk_prepare_enable(dmc->mout_bpll);
+	ret = clk_prepare_enable(dmc->fout_bpll);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(dmc->mout_bpll);
+	if (ret) {
+		clk_disable_unprepare(dmc->fout_bpll);
+		return ret;
+	}
 
 	/*
 	 * Some bootloaders do not set clock routes correctly.

Re: [PATCH] memory: exynos5422-dmc: handle clock enable failures

[Markus Elfring]

> Check clock-enable failures during probe.
> 
> If a later clock cannot be enabled, unwind clocks already enabled on
> that path before returning the error.

How do you think about to add any tags (like “Fixes” and “Cc”) accordingly?

See also once more:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/stable-kernel-rules.rst?h=v7.2#n34
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v7.2#n145
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v7.2#n792

Regards,
Markus

Re: [PATCH] memory: exynos5422-dmc: handle clock enable failures

[Krzysztof Kozlowski]

On 18/08/2026 15:19, Jiawen Liu wrote:
> Check clock-enable failures during probe.
> 
> If a later clock cannot be enabled, unwind clocks already enabled on
> that path before returning the error.
> 
> Signed-off-by: jiawen <1298662399@qq.com>

SoB does not match your "From" name. Please configure git correctly to
use consistent identity.

Best regards,
Krzysztof

Re: [PATCH] memory: exynos5422-dmc: handle clock enable failures

[Lukasz Luba]

On 8/18/26 14:19, Jiawen Liu wrote:
> Check clock-enable failures during probe.
> 
> If a later clock cannot be enabled, unwind clocks already enabled on
> that path before returning the error.
> 
> Signed-off-by: jiawen <1298662399@qq.com>
> ---
> diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
> --- a/drivers/memory/samsung/exynos5422-dmc.c
> +++ b/drivers/memory/samsung/exynos5422-dmc.c
> @@ -1297,8 +1297,15 @@
>   	if (ret)
>   		return ret;
>   
> -	clk_prepare_enable(dmc->fout_bpll);
> -	clk_prepare_enable(dmc->mout_bpll);
> +	ret = clk_prepare_enable(dmc->fout_bpll);
> +	if (ret)
> +		return ret;
> +
> +	ret = clk_prepare_enable(dmc->mout_bpll);
> +	if (ret) {
> +		clk_disable_unprepare(dmc->fout_bpll);
> +		return ret;
> +	}
>   
>   	/*
>   	 * Some bootloaders do not set clock routes correctly.
> 

As other folks mentioned, please align to the procedures for
sending the patches.

The change itself looks good, so looking forward for the proper
v2.

Regards,
Lukasz