linux-kernel - [PATCH] ublk_drv: initialize ret variable

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Message-Id: <20220716131555.2014270-1-trix@redhat.com>
Date:   Sat, 16 Jul 2022 09:15:55 -0400
From:   Tom Rix <trix@...hat.com>
To:     axboe@...nel.dk, nathan@...nel.org, ndesaulniers@...gle.com,
        ming.lei@...hat.com
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Tom Rix <trix@...hat.com>
Subject: [PATCH] ublk_drv: initialize ret variable

clang build fails with
drivers/block/ublk_drv.c:1304:6: error: variable 'ret' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]

When the call to ublk_get_device_from_id() fails, ret is used without being
initized.  So initialize.

Fixes: 71f28f3136af ("ublk_drv: add io_uring based userspace block driver")
Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/block/ublk_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index 52fd0af8a4f2..4d1199c98026 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -1298,7 +1298,7 @@ static int ublk_ctrl_get_queue_affinity(struct io_uring_cmd *cmd)
 	struct ublk_device *ub;
 	unsigned long queue;
 	unsigned int retlen;
-	int ret;
+	int ret = -ENODEV;
 
 	ub = ublk_get_device_from_id(header->dev_id);
 	if (!ub)
-- 
2.27.0