Re: [PATCH v4 3/4] platform/x86: intel_scu_ipc: Don't override scu in intel_scu_ipc_dev_simple_command()

[Ilpo Järvinen]

On Wed, 13 Sep 2023, Stephen Boyd wrote:

> Andy discovered this bug during patch review. The 'scu' argument to this
> function shouldn't be overridden by the function itself. It doesn't make
> any sense. Looking at the commit history, we see that commit
> f57fa18583f5 ("platform/x86: intel_scu_ipc: Introduce new SCU IPC API")
> removed the setting of the scu to ipcdev in other functions, but not
> this one. That was an oversight. Remove this line so that we stop
> overriding the scu instance that is used by this function.
> 
> Reported-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> Closes: https://lore.kernel.org/r/ZPjdZ3xNmBEBvNiS@xxxxxxxxxxxxxxxxxx

This looks somewhat unusual way to tag it. I'd just drop the Closes tag 
as the email list is not a bug tracter.

Other than that,
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>

-- 
 i.

> Cc: Prashant Malani <pmalani@xxxxxxxxxxxx>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> Fixes: f57fa18583f5 ("platform/x86: intel_scu_ipc: Introduce new SCU IPC API")
> Signed-off-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
> ---
>  drivers/platform/x86/intel_scu_ipc.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/intel_scu_ipc.c b/drivers/platform/x86/intel_scu_ipc.c
> index 299c15312acb..3271f81a9c00 100644
> --- a/drivers/platform/x86/intel_scu_ipc.c
> +++ b/drivers/platform/x86/intel_scu_ipc.c
> @@ -443,7 +443,6 @@ int intel_scu_ipc_dev_simple_command(struct intel_scu_ipc_dev *scu, int cmd,
>  		mutex_unlock(&ipclock);
>  		return -ENODEV;
>  	}
> -	scu = ipcdev;
>  	cmdval = sub << 12 | cmd;
>  	ipc_command(scu, cmdval);
>  	err = intel_scu_ipc_check_status(scu);
>