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

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Message-Id: <20201203223137.1205933-1-arnd@kernel.org>
Date:   Thu,  3 Dec 2020 23:31:26 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     "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>,
        Avri Altman <avri.altman@....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-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: [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>
---
 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