linux-kernel - RE: [PATCH] ufshcd: fix Wsometimes-uninitialized warning

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Message-ID: <DM6PR04MB6575519252EE03084136683CFCF00@DM6PR04MB6575.namprd04.prod.outlook.com>
Date:   Sat, 5 Dec 2020 08:11:32 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Arnd Bergmann <arnd@...nel.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>
CC:     Arnd Bergmann <arnd@...db.de>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Can Guo <cang@...eaurora.org>,
        Asutosh Das <asutoshd@...eaurora.org>,
        Bean Huo <beanhuo@...ron.com>,
        Bart Van Assche <bvanassche@....org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "clang-built-linux@...glegroups.com" 
        <clang-built-linux@...glegroups.com>
Subject: RE: [PATCH] ufshcd: fix Wsometimes-uninitialized warning

> 
> 
> From: Arnd Bergmann <arnd@...db.de>
> 
> clang complains about a possible code path in which a variable is
> used without an initialization:
> 
> drivers/scsi/ufs/ufshcd.c:7690:3: error: variable 'sdp' is used uninitialized
> whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
>                 BUG_ON(1);
>                 ^~~~~~~~~
> include/asm-generic/bug.h:63:36: note: expanded from macro 'BUG_ON'
>  #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
>                                    ^~~~~~~~~~~~~~~~~~~
> 
> Turn the BUG_ON(1) into an unconditional BUG() that makes it clear
> to clang that this code path is never hit.
> 
> Fixes: 4f3e900b6282 ("scsi: ufs: Clear UAC for FFU and RPMB LUNs")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
Reviewed-by: Avri Altman <avri.altman@....com>

> ---
>  drivers/scsi/ufs/ufshcd.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index f165baee937f..b4f7c4263334 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -7687,7 +7687,7 @@ static int ufshcd_clear_ua_wlun(struct ufs_hba
> *hba, u8 wlun)
>         else if (wlun == UFS_UPIU_RPMB_WLUN)
>                 sdp = hba->sdev_rpmb;
>         else
> -               BUG_ON(1);
> +               BUG();
>         if (sdp) {
>                 ret = scsi_device_get(sdp);
>                 if (!ret && !scsi_device_online(sdp)) {
> --
> 2.27.0