linux-kernel - Re: [PATCH v4 3/4] platform/x86: intel_scu_ipc: Don't override scu in intel_scu_ipc_dev_simple

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Date:   Fri, 15 Sep 2023 17:45:42 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Stephen Boyd <swboyd@...omium.org>
cc:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, patches@...ts.linux.dev,
        platform-driver-x86@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Prashant Malani <pmalani@...omium.org>
Subject: Re: [PATCH v4 3/4] platform/x86: intel_scu_ipc: Don't override scu
 in intel_scu_ipc_dev_simple_command()

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@...ux.intel.com>
> Closes: https://lore.kernel.org/r/ZPjdZ3xNmBEBvNiS@smile.fi.intel.com

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@...ux.intel.com>

-- 
 i.

> Cc: Prashant Malani <pmalani@...omium.org>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Fixes: f57fa18583f5 ("platform/x86: intel_scu_ipc: Introduce new SCU IPC API")
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> ---
>  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);
>