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* [ammarfaizi2-block:axboe/linux-block/for-next 12/103] drivers/block/ublk_drv.c:831:6: warning: variable 'io' is used uninitialized whenever 'if' condition is true
@ 2022-07-15 19:53 kernel test robot
  0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2022-07-15 19:53 UTC (permalink / raw)
  To: Ming Lei
  Cc: llvm, kbuild-all, Ammar Faizi, GNU/Weeb Mailing List,
	linux-kernel, Jens Axboe

tree:   https://github.com/ammarfaizi2/linux-block axboe/linux-block/for-next
head:   dc2ebf038c4a21786283c56d67e3cfd995275771
commit: 71f28f3136aff5890cd56de78abc673f8393cad9 [12/103] ublk_drv: add io_uring based userspace block driver
config: hexagon-buildonly-randconfig-r001-20220715 (https://download.01.org/0day-ci/archive/20220716/[email protected]/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 2da550140aa98cf6a3e96417c87f1e89e3a26047)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/ammarfaizi2/linux-block/commit/71f28f3136aff5890cd56de78abc673f8393cad9
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block axboe/linux-block/for-next
        git checkout 71f28f3136aff5890cd56de78abc673f8393cad9
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/block/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <[email protected]>

All warnings (new ones prefixed by >>):

>> drivers/block/ublk_drv.c:831:6: warning: variable 'io' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
           if (tag >= ubq->q_depth)
               ^~~~~~~~~~~~~~~~~~~
   drivers/block/ublk_drv.c:881:2: note: uninitialized use occurs here
           io->flags &= ~UBLK_IO_FLAG_ACTIVE;
           ^~
   drivers/block/ublk_drv.c:831:2: note: remove the 'if' if its condition is always false
           if (tag >= ubq->q_depth)
           ^~~~~~~~~~~~~~~~~~~~~~~~
   drivers/block/ublk_drv.c:828:6: warning: variable 'io' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
           if (ubq->ubq_daemon && ubq->ubq_daemon != current)
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/block/ublk_drv.c:881:2: note: uninitialized use occurs here
           io->flags &= ~UBLK_IO_FLAG_ACTIVE;
           ^~
   drivers/block/ublk_drv.c:828:2: note: remove the 'if' if its condition is always false
           if (ubq->ubq_daemon && ubq->ubq_daemon != current)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/block/ublk_drv.c:825:6: warning: variable 'io' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
           if (!ubq || ub_cmd->q_id != ubq->q_id)
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/block/ublk_drv.c:881:2: note: uninitialized use occurs here
           io->flags &= ~UBLK_IO_FLAG_ACTIVE;
           ^~
   drivers/block/ublk_drv.c:825:2: note: remove the 'if' if its condition is always false
           if (!ubq || ub_cmd->q_id != ubq->q_id)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/block/ublk_drv.c:825:6: warning: variable 'io' is used uninitialized whenever '||' condition is true [-Wsometimes-uninitialized]
           if (!ubq || ub_cmd->q_id != ubq->q_id)
               ^~~~
   drivers/block/ublk_drv.c:881:2: note: uninitialized use occurs here
           io->flags &= ~UBLK_IO_FLAG_ACTIVE;
           ^~
   drivers/block/ublk_drv.c:825:6: note: remove the '||' if its condition is always false
           if (!ubq || ub_cmd->q_id != ubq->q_id)
               ^~~~~~~
   drivers/block/ublk_drv.c:821:6: warning: variable 'io' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
           if (ub_cmd->q_id >= ub->dev_info.nr_hw_queues)
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/block/ublk_drv.c:881:2: note: uninitialized use occurs here
           io->flags &= ~UBLK_IO_FLAG_ACTIVE;
           ^~
   drivers/block/ublk_drv.c:821:2: note: remove the 'if' if its condition is always false
           if (ub_cmd->q_id >= ub->dev_info.nr_hw_queues)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/block/ublk_drv.c:818:6: warning: variable 'io' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
           if (!(issue_flags & IO_URING_F_SQE128))
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/block/ublk_drv.c:881:2: note: uninitialized use occurs here
           io->flags &= ~UBLK_IO_FLAG_ACTIVE;
           ^~
   drivers/block/ublk_drv.c:818:2: note: remove the 'if' if its condition is always false
           if (!(issue_flags & IO_URING_F_SQE128))
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/block/ublk_drv.c:809:20: note: initialize the variable 'io' to silence this warning
           struct ublk_io *io;
                             ^
                              = NULL
>> drivers/block/ublk_drv.c:1237:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
           if (!ub)
               ^~~
   drivers/block/ublk_drv.c:1263:9: note: uninitialized use occurs here
           return ret;
                  ^~~
   drivers/block/ublk_drv.c:1237:2: note: remove the 'if' if its condition is always false
           if (!ub)
           ^~~~~~~~
   drivers/block/ublk_drv.c:1234:9: note: initialize the variable 'ret' to silence this warning
           int ret;
                  ^
                   = 0
   7 warnings generated.


vim +831 drivers/block/ublk_drv.c

   803	
   804	static int ublk_ch_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)
   805	{
   806		struct ublksrv_io_cmd *ub_cmd = (struct ublksrv_io_cmd *)cmd->cmd;
   807		struct ublk_device *ub = cmd->file->private_data;
   808		struct ublk_queue *ubq;
   809		struct ublk_io *io;
   810		u32 cmd_op = cmd->cmd_op;
   811		unsigned tag = ub_cmd->tag;
   812		int ret = -EINVAL;
   813	
   814		pr_devel("%s: received: cmd op %d queue %d tag %d result %d\n",
   815				__func__, cmd->cmd_op, ub_cmd->q_id, tag,
   816				ub_cmd->result);
   817	
   818		if (!(issue_flags & IO_URING_F_SQE128))
   819			goto out;
   820	
   821		if (ub_cmd->q_id >= ub->dev_info.nr_hw_queues)
   822			goto out;
   823	
   824		ubq = ublk_get_queue(ub, ub_cmd->q_id);
 > 825		if (!ubq || ub_cmd->q_id != ubq->q_id)
   826			goto out;
   827	
   828		if (ubq->ubq_daemon && ubq->ubq_daemon != current)
   829			goto out;
   830	
 > 831		if (tag >= ubq->q_depth)
   832			goto out;
   833	
   834		io = &ubq->ios[tag];
   835	
   836		/* there is pending io cmd, something must be wrong */
   837		if (io->flags & UBLK_IO_FLAG_ACTIVE) {
   838			ret = -EBUSY;
   839			goto out;
   840		}
   841	
   842		switch (cmd_op) {
   843		case UBLK_IO_FETCH_REQ:
   844			/* UBLK_IO_FETCH_REQ is only allowed before queue is setup */
   845			if (ublk_queue_ready(ubq)) {
   846				ret = -EBUSY;
   847				goto out;
   848			}
   849			/*
   850			 * The io is being handled by server, so COMMIT_RQ is expected
   851			 * instead of FETCH_REQ
   852			 */
   853			if (io->flags & UBLK_IO_FLAG_OWNED_BY_SRV)
   854				goto out;
   855			/* FETCH_RQ has to provide IO buffer */
   856			if (!ub_cmd->addr)
   857				goto out;
   858			io->cmd = cmd;
   859			io->flags |= UBLK_IO_FLAG_ACTIVE;
   860			io->addr = ub_cmd->addr;
   861	
   862			ublk_mark_io_ready(ub, ubq);
   863			break;
   864		case UBLK_IO_COMMIT_AND_FETCH_REQ:
   865			/* FETCH_RQ has to provide IO buffer */
   866			if (!ub_cmd->addr)
   867				goto out;
   868			if (!(io->flags & UBLK_IO_FLAG_OWNED_BY_SRV))
   869				goto out;
   870			io->addr = ub_cmd->addr;
   871			io->flags |= UBLK_IO_FLAG_ACTIVE;
   872			io->cmd = cmd;
   873			ublk_commit_completion(ub, ub_cmd);
   874			break;
   875		default:
   876			goto out;
   877		}
   878		return -EIOCBQUEUED;
   879	
   880	 out:
   881		io->flags &= ~UBLK_IO_FLAG_ACTIVE;
   882		io_uring_cmd_done(cmd, ret, 0);
   883		pr_devel("%s: complete: cmd op %d, tag %d ret %x io_flags %x\n",
   884				__func__, cmd_op, tag, ret, io->flags);
   885		return -EIOCBQUEUED;
   886	}
   887	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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