linux-kernel - RE: [PATCH] rtlwifi: btcoexist: fix conditions branches that are never executed

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Message-ID: <76613dd5c4154c24bb53efd2551dd33c@realtek.com>
Date:   Wed, 7 Dec 2022 01:06:00 +0000
From:   Ping-Ke Shih <pkshih@...ltek.com>
To:     Peter Kosyh <pkosyh@...dex.ru>
CC:     Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "lvc-project@...uxtesting.org" <lvc-project@...uxtesting.org>
Subject: RE: [PATCH] rtlwifi: btcoexist: fix conditions branches that are never executed


> -----Original Message-----
> From: Peter Kosyh <pkosyh@...dex.ru>
> Sent: Tuesday, December 6, 2022 6:49 PM
> To: Ping-Ke Shih <pkshih@...ltek.com>
> Cc: Peter Kosyh <pkosyh@...dex.ru>; Kalle Valo <kvalo@...nel.org>; David S. Miller <davem@...emloft.net>;
> Eric Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; linux-wireless@...r.kernel.org;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org; lvc-project@...uxtesting.org
> Subject: [PATCH] rtlwifi: btcoexist: fix conditions branches that are never executed
> 
> Commit 40ca18823515 ("rtlwifi: btcoex: 23b 1ant: fine tune for wifi not
>  connected") introduced never executed branches.
> 
> Compile test only.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Signed-off-by: Peter Kosyh <pkosyh@...dex.ru>

I compare with vendor driver and confirm these changes are correct.
Thank you.

Acked-by: Ping-Ke Shih <pkshih@...ltek.com>


> ---
> I'm not sure that patch do right thing! But these two places are really
> never executed and should be fixed. I hope that Ping-Ka could check this.
> 
>  .../net/wireless/realtek/rtlwifi/btcoexist/halbtc8723b1ant.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtc8723b1ant.c
> b/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtc8723b1ant.c
> index 70492929d7e4..039bbedb41c2 100644
> --- a/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtc8723b1ant.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtc8723b1ant.c
> @@ -1903,7 +1903,7 @@ btc8723b1ant_action_wifi_not_conn_scan(struct btc_coexist *btcoexist)
>  						true, 32);
>  			halbtc8723b1ant_coex_table_with_type(btcoexist,
>  							     NORMAL_EXEC, 4);
> -		} else if (bt_link_info->a2dp_exist) {
> +		} else if (bt_link_info->pan_exist) {
>  			halbtc8723b1ant_ps_tdma(btcoexist, NORMAL_EXEC,
>  						true, 22);
>  			halbtc8723b1ant_coex_table_with_type(btcoexist,
> @@ -1964,8 +1964,7 @@ static void btc8723b1ant_action_wifi_conn_scan(struct btc_coexist *btcoexist)
>  						true, 32);
>  			halbtc8723b1ant_coex_table_with_type(btcoexist,
>  							     NORMAL_EXEC, 4);
> -		} else if (bt_link_info->a2dp_exist &&
> -			   bt_link_info->pan_exist) {
> +		} else if (bt_link_info->pan_exist) {
>  			halbtc8723b1ant_ps_tdma(btcoexist, NORMAL_EXEC,
>  						true, 22);
>  			halbtc8723b1ant_coex_table_with_type(btcoexist,
> --
> 2.38.1