linux-kernel - Re: [PATCH] platform/x86: toshiba_acpi: Fix the wrong variable assignment

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Date:   Tue, 24 Nov 2020 13:07:44 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     xiakaixu1987@...il.com, coproscefalo@...il.com,
        mgross@...ux.intel.com
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kaixu Xia <kaixuxia@...cent.com>
Subject: Re: [PATCH] platform/x86: toshiba_acpi: Fix the wrong variable
 assignment

Hi,

On 11/22/20 6:49 AM, xiakaixu1987@...il.com wrote:
> From: Kaixu Xia <kaixuxia@...cent.com>
> 
> The commit 78429e55e4057 ("platform/x86: toshiba_acpi: Clean up
> variable declaration") cleans up variable declaration in
> video_proc_write(). Seems it does the variable assignment in the
> wrong place, this results in dead code and changes the source code
> logic. Fix it by doing the assignment at the beginning of the funciton.
> 
> Fixes: 78429e55e4057 ("platform/x86: toshiba_acpi: Clean up variable declaration")
> Reported-by: Tosk Robot <tencent_os_robot@...cent.com>
> Signed-off-by: Kaixu Xia <kaixuxia@...cent.com>

Thank you for your patch, I've applied this patch to my review-hans 
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans

> ---
>  drivers/platform/x86/toshiba_acpi.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
> index e557d757c647..fa7232ad8c39 100644
> --- a/drivers/platform/x86/toshiba_acpi.c
> +++ b/drivers/platform/x86/toshiba_acpi.c
> @@ -1478,7 +1478,7 @@ static ssize_t video_proc_write(struct file *file, const char __user *buf,
>  	struct toshiba_acpi_dev *dev = PDE_DATA(file_inode(file));
>  	char *buffer;
>  	char *cmd;
> -	int lcd_out, crt_out, tv_out;
> +	int lcd_out = -1, crt_out = -1, tv_out = -1;
>  	int remain = count;
>  	int value;
>  	int ret;
> @@ -1510,7 +1510,6 @@ static ssize_t video_proc_write(struct file *file, const char __user *buf,
>  
>  	kfree(cmd);
>  
> -	lcd_out = crt_out = tv_out = -1;
>  	ret = get_video_status(dev, &video_out);
>  	if (!ret) {
>  		unsigned int new_video_out = video_out;
>