linux-kernel - [PATCH 5.2 257/413] scsi: sd_zbc: Fix compilation warning

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Message-Id: <20190724191754.404270441@linuxfoundation.org>
Date:   Wed, 24 Jul 2019 21:19:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Damien Le Moal <damien.lemoal@....com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 5.2 257/413] scsi: sd_zbc: Fix compilation warning

From: Damien Le Moal <damien.lemoal@....com>

commit 0cdc58580b37a160fac4b884266b8b7cb096f539 upstream.

kbuild test robot gets the following compilation warning using gcc 7.4
cross compilation for c6x (GCC_VERSION=7.4.0 make.cross ARCH=c6x).

   In file included from include/asm-generic/bug.h:18:0,
                    from arch/c6x/include/asm/bug.h:12,
                    from include/linux/bug.h:5,
                    from include/linux/thread_info.h:12,
                    from include/asm-generic/current.h:5,
                    from ./arch/c6x/include/generated/asm/current.h:1,
                    from include/linux/sched.h:12,
                    from include/linux/blkdev.h:5,
                    from drivers//scsi/sd_zbc.c:11:
   drivers//scsi/sd_zbc.c: In function 'sd_zbc_read_zones':
>> include/linux/kernel.h:62:48: warning: 'zone_blocks' may be used
   uninitialized in this function [-Wmaybe-uninitialized]
    #define __round_mask(x, y) ((__typeof__(x))((y)-1))
                                                   ^
   drivers//scsi/sd_zbc.c:464:6: note: 'zone_blocks' was declared here
     u32 zone_blocks;
         ^~~~~~~~~~~

This is a false-positive report. The variable zone_blocks is always
initialized in sd_zbc_check_zones() before use. It is not initialized
only and only if sd_zbc_check_zones() fails.

Avoid this warning by initializing the zone_blocks variable to 0.

Fixes: 5f832a395859 ("scsi: sd_zbc: Fix sd_zbc_check_zones() error checks")
Cc: Stable <stable@...r.kernel.org>
Signed-off-by: Damien Le Moal <damien.lemoal@....com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/sd_zbc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -417,7 +417,7 @@ int sd_zbc_read_zones(struct scsi_disk *
 {
 	struct gendisk *disk = sdkp->disk;
 	unsigned int nr_zones;
-	u32 zone_blocks;
+	u32 zone_blocks = 0;
 	int ret;
 
 	if (!sd_is_zoned(sdkp))