netdev - Re: [PATCH] rtw88: Initialize ret in rtw_wow_check_fw

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Date:   Fri, 31 Jan 2020 13:03:48 +0200
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Tony Chuang <yhchuang@...ltek.com>
Cc:     Nathan Chancellor <natechancellor@...il.com>,
        "linux-wireless\@vger.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev\@vger.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        "clang-built-linux\@googlegroups.com" 
        <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] rtw88: Initialize ret in rtw_wow_check_fw_status

Tony Chuang <yhchuang@...ltek.com> writes:

> From: Nathan Chancellor
>> Subject: [PATCH] rtw88: Initialize ret in rtw_wow_check_fw_status
>> 
>> Clang warns a few times (trimmed for brevity):
>> 
>> ../drivers/net/wireless/realtek/rtw88/wow.c:295:7: warning: variable
>> 'ret' is used uninitialized whenever 'if' condition is false
>> [-Wsometimes-uninitialized]
>> 
>> Initialize ret to true and change the other assignments to false because
>> it is a boolean value.
>> 
>> Fixes: 44bc17f7f5b3 ("rtw88: support wowlan feature for 8822c")
>> Link: https://github.com/ClangBuiltLinux/linux/issues/850
>> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
>> ---
>>  drivers/net/wireless/realtek/rtw88/wow.c | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>> 
>> diff --git a/drivers/net/wireless/realtek/rtw88/wow.c
>> b/drivers/net/wireless/realtek/rtw88/wow.c
>> index af5c27e1bb07..5db49802c72c 100644
>> --- a/drivers/net/wireless/realtek/rtw88/wow.c
>> +++ b/drivers/net/wireless/realtek/rtw88/wow.c
>> @@ -283,18 +283,18 @@ static void rtw_wow_rx_dma_start(struct rtw_dev
>> *rtwdev)
>> 
>>  static bool rtw_wow_check_fw_status(struct rtw_dev *rtwdev, bool
>> wow_enable)
>>  {
>> -	bool ret;
>> +	bool ret = true;
>> 
>>  	/* wait 100ms for wow firmware to finish work */
>>  	msleep(100);
>> 
>>  	if (wow_enable) {
>>  		if (!rtw_read8(rtwdev, REG_WOWLAN_WAKE_REASON))
>> -			ret = 0;
>> +			ret = false;
>>  	} else {
>>  		if (rtw_read32_mask(rtwdev, REG_FE1IMR, BIT_FS_RXDONE) == 0
>> &&
>>  		    rtw_read32_mask(rtwdev, REG_RXPKT_NUM,
>> BIT_RW_RELEASE) == 0)
>> -			ret = 0;
>> +			ret = false;
>>  	}
>> 
>>  	if (ret)
>> --
>> 2.25.0
>
> NACK.
>
> This patch could lead to incorrect behavior of WOW.
> I will send a new patch to fix it, and change the type to "int".

Please send it separately so that I can queue it to v5.6.

-- 
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches