linux-kernel - Re: [PATCH] ACPI: APEI: Remove redundant assignments in erst_dbg

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Message-ID: <7c0ea575-7682-4601-8922-49684d929374@linux.alibaba.com>
Date: Fri, 5 Sep 2025 09:19:32 +0800
From: Shuai Xue <xueshuai@...ux.alibaba.com>
To: Thorsten Blum <thorsten.blum@...ux.dev>,
 "Rafael J. Wysocki" <rafael@...nel.org>, Tony Luck <tony.luck@...el.com>,
 Borislav Petkov <bp@...en8.de>, Hanjun Guo <guohanjun@...wei.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Len Brown <lenb@...nel.org>,
 Al Viro <viro@...iv.linux.org.uk>
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI: APEI: Remove redundant assignments in
 erst_dbg_{ioctl|write}()

在 2025/9/4 06:49, Thorsten Blum 写道:
> Use the result of copy_from_user() directly instead of assigning it to
> the local variable 'rc' and then overwriting it in erst_dbg_write() or
> immediately returning from erst_dbg_ioctl().
> 
> Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
> ---
>   drivers/acpi/apei/erst-dbg.c | 8 +++-----
>   1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/acpi/apei/erst-dbg.c b/drivers/acpi/apei/erst-dbg.c
> index 246076341e8c..ff0e8bf8e97a 100644
> --- a/drivers/acpi/apei/erst-dbg.c
> +++ b/drivers/acpi/apei/erst-dbg.c
> @@ -60,9 +60,8 @@ static long erst_dbg_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
>   
>   	switch (cmd) {
>   	case APEI_ERST_CLEAR_RECORD:
> -		rc = copy_from_user(&record_id, (void __user *)arg,
> -				    sizeof(record_id));
> -		if (rc)
> +		if (copy_from_user(&record_id, (void __user *)arg,
> +				   sizeof(record_id)))
>   			return -EFAULT;
>   		return erst_clear(record_id);
>   	case APEI_ERST_GET_RECORD_COUNT:
> @@ -175,8 +174,7 @@ static ssize_t erst_dbg_write(struct file *filp, const char __user *ubuf,
>   		erst_dbg_buf = p;
>   		erst_dbg_buf_len = usize;
>   	}
> -	rc = copy_from_user(erst_dbg_buf, ubuf, usize);
> -	if (rc) {
> +	if (copy_from_user(erst_dbg_buf, ubuf, usize)) {
>   		rc = -EFAULT;
>   		goto out;
>   	}

Hi Thorsten,
Thanks for the patch.

The changes look good to me.

Since this is a code cleanup with no functional changes, could you
please mention "no functional change" or similar wording in the commit
message to make it clear?

With that addressed:
Reviewed-by: Shuai Xue <xueshuai@...ux.alibaba.com>

Thanks,
Shuai