linux-kernel - Re: [PATCH 1/5] Staging: rtl8723bs: os_dep: Fix assignment in if condition

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Message-ID: <d57e41f96a23f63aeb720d0ea73ba2b2bed0a938.camel@perches.com>
Date:   Sat, 09 Mar 2019 10:39:32 -0800
From:   Joe Perches <joe@...ches.com>
To:     Guilherme Tadashi Maeoka <gui.maeoka@...il.com>,
        gregkh@...uxfoundation.org
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] Staging: rtl8723bs: os_dep: Fix assignment in if
 condition

On Sat, 2019-03-09 at 15:30 -0300, Guilherme Tadashi Maeoka wrote:
> Fix an assignment in if condition.
> 
> Signed-off-by: Guilherme Tadashi Maeoka <gui.maeoka@...il.com>
> ---
>  drivers/staging/rtl8723bs/os_dep/osdep_service.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/rtl8723bs/os_dep/osdep_service.c b/drivers/staging/rtl8723bs/os_dep/osdep_service.c
> index 73b87da15eb2..c7fdcc6bbae3 100644
> --- a/drivers/staging/rtl8723bs/os_dep/osdep_service.c
> +++ b/drivers/staging/rtl8723bs/os_dep/osdep_service.c
> @@ -162,7 +162,9 @@ static int retriveFromFile(char *path, u8 *buf, u32 sz)
>  	struct file *fp;
>  
>  	if (path && buf) {
> -		if (0 == (ret =openFile(&fp, path, O_RDONLY, 0))) {
> +		ret = openFile(&fp, path, O_RDONLY, 0);
> +
> +		if (ret == 0) {
>  			DBG_871X("%s openFile path:%s fp =%p\n", __func__, path , fp);
>  
>  			oldfs = get_fs(); set_fs(KERNEL_DS);

More common kernel style would be to rewrite the function
(and to fix the typo of retrieve) to something like:  

static int retrieveFromFile(char *path, u8 *buf, u32 sz)
{
	int ret;
	mm_segment_t oldfs;
	struct file *fp;

	if (!path || !buf) {
		DBG_871X("%s NULL pointer\n", __func__);
		return -EINVAL;
	}

	ret = openFile(&fp, path, O_RDONLY, 0);
	if (ret) {
		DBG_871X("%s openFile path:%s Fail, ret:%d\n",
			 __func__, path, ret);
		return ret;
	}

	DBG_871X("%s openFile path:%s fp =%p\n", __func__, path , fp);

	oldfs = get_fs();
	set_fs(KERNEL_DS);
	ret = readFile(fp, buf, sz);
	set_fs(oldfs);
	closeFile(fp);

	DBG_871X("%s readFile, ret:%d\n", __func__, ret);

	return ret;
}