linux-kernel - [PATCH 6/7] scsi: aha1542: avoid uninitialized variable warnings

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Message-Id: <1453910247-3447628-7-git-send-email-arnd@arndb.de>
Date:	Wed, 27 Jan 2016 16:57:22 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	James.Bottomley@...senPartnership.com
Cc:	linux-arm-kernel@...ts.infradead.org,
	Arnd Bergmann <arnd@...db.de>, linux-scsi@...r.kernel.org,
	"James E.J. Bottomley" <JBottomley@...n.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 6/7] scsi: aha1542: avoid uninitialized variable warnings

Gcc incorrectly detects that two variables in aha1542_queuecommand might
be used without an initialization:

scsi/aha1542.c: In function 'aha1542_queuecommand':
scsi/aha1542.c:382:16: error: 'cptr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
scsi/aha1542.c:379:11: error: 'sg_count' may be used uninitialized in this function [-Werror=maybe-uninitialized]

The only user of these is doing the same check that the assigment
has, so it is actually guaranteed to work. Adding an "else" clause
with a fake initialization shuts up the warning.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/scsi/aha1542.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/scsi/aha1542.c b/drivers/scsi/aha1542.c
index 5b8b2937a3fe..7db448ec8beb 100644
--- a/drivers/scsi/aha1542.c
+++ b/drivers/scsi/aha1542.c
@@ -403,6 +403,9 @@ static int aha1542_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
 		cptr = kmalloc(sizeof(*cptr) * sg_count, GFP_KERNEL | GFP_DMA);
 		if (!cptr)
 			return SCSI_MLQUEUE_HOST_BUSY;
+	} else {
+		sg_count = 0;
+		cptr = NULL;
 	}
 
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