diff options
authorMing Lei <>2022-07-16 17:53:44 +0800
committerJens Axboe <>2022-07-16 06:32:48 -0600
commitf2450f8a2c1ec3e88d6674f747b913aa5f21fa59 (patch)
parent020e3618cc81abf11fe6bffaac27861ff94707ce (diff)
ublk_drv: fix build warning with -Wmaybe-uninitialized and one sparse warning
After applying -Wmaybe-uninitialized manually, two build warnings are triggered: drivers/block/ublk_drv.c:940:11: warning: ‘io’ may be used uninitialized [-Wmaybe-uninitialized] 940 | io->flags &= ~UBLK_IO_FLAG_ACTIVE; drivers/block/ublk_drv.c: In function ‘ublk_ctrl_uring_cmd’: drivers/block/ublk_drv.c:1531:9: warning: ‘ret’ may be used uninitialized [-Wmaybe-uninitialized] Fix the 1st one by removing 'io->flags &= ~UBLK_IO_FLAG_ACTIVE;' which isn't needed since the function always return successfully after setting this flag. Fix the 2nd one by always initializing 'ret'. Also fix another sparse warning of 'sparse: sparse: incorrect type in return expression' by changing return type of ublk_setup_iod(). Reported-by: kernel test robot <> Signed-off-by: Ming Lei <> Link: Signed-off-by: Jens Axboe <>
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index f10c4319dc1f..2c1b01d7f27d 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -407,7 +407,7 @@ static inline unsigned int ublk_req_build_flags(struct request *req)
return flags;
-static int ublk_setup_iod(struct ublk_queue *ubq, struct request *req)
+static blk_status_t ublk_setup_iod(struct ublk_queue *ubq, struct request *req)
struct ublksrv_io_desc *iod = ublk_get_iod(ubq, req->tag);
struct ublk_io *io = &ubq->ios[req->tag];
@@ -937,7 +937,6 @@ static int ublk_ch_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)
- io->flags &= ~UBLK_IO_FLAG_ACTIVE;
io_uring_cmd_done(cmd, ret, 0);
pr_devel("%s: complete: cmd op %d, tag %d ret %x io_flags %x\n",
__func__, cmd_op, tag, ret, io->flags);
@@ -1299,13 +1298,12 @@ 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 = -EINVAL;
ub = ublk_get_device_from_id(header->dev_id);
if (!ub)
goto out;
- ret = -EINVAL;
queue = header->data[0];
if (queue >= ub->dev_info.nr_hw_queues)
goto out;