drivers/md/dm-vdo/data-vio.c:976 vdo_launch_bio() warn: inconsistent returns '&pool->lock'.

[Dan Carpenter]

Hi Mike,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   3d5ad2d4eca337e80f38df77de89614aa5aaceb9
commit: f36b1d3ba533d21b5b793623f05761b0297d114e dm vdo: use a proper Makefile for dm-vdo
config: x86_64-randconfig-161-20241019 (https://download.01.org/0day-ci/archive/20241019/202410191209.osrd8z9H-lkp@xxxxxxxxx/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
| Closes: https://lore.kernel.org/r/202410191209.osrd8z9H-lkp@xxxxxxxxx/

smatch warnings:
drivers/md/dm-vdo/data-vio.c:976 vdo_launch_bio() warn: inconsistent returns '&pool->lock'.

vim +976 drivers/md/dm-vdo/data-vio.c

79535a7881c0cb Matthew Sakai 2023-11-16  958  void vdo_launch_bio(struct data_vio_pool *pool, struct bio *bio)
79535a7881c0cb Matthew Sakai 2023-11-16  959  {
79535a7881c0cb Matthew Sakai 2023-11-16  960  	struct data_vio *data_vio;
79535a7881c0cb Matthew Sakai 2023-11-16  961  
79535a7881c0cb Matthew Sakai 2023-11-16  962  	ASSERT_LOG_ONLY(!vdo_is_state_quiescent(&pool->state),
79535a7881c0cb Matthew Sakai 2023-11-16  963  			"data_vio_pool not quiescent on acquire");
79535a7881c0cb Matthew Sakai 2023-11-16  964  
79535a7881c0cb Matthew Sakai 2023-11-16  965  	bio->bi_private = (void *) jiffies;
79535a7881c0cb Matthew Sakai 2023-11-16  966  	spin_lock(&pool->lock);
79535a7881c0cb Matthew Sakai 2023-11-16  967  	if ((bio_op(bio) == REQ_OP_DISCARD) &&
79535a7881c0cb Matthew Sakai 2023-11-16  968  	    !acquire_permit(&pool->discard_limiter, bio))
79535a7881c0cb Matthew Sakai 2023-11-16  969  		return;
                                                        ^^^^^^

79535a7881c0cb Matthew Sakai 2023-11-16  970  
79535a7881c0cb Matthew Sakai 2023-11-16  971  	if (!acquire_permit(&pool->limiter, bio))
79535a7881c0cb Matthew Sakai 2023-11-16  972  		return;
                                                        ^^^^^^
Still holding pool->lock on these paths.

79535a7881c0cb Matthew Sakai 2023-11-16  973  
79535a7881c0cb Matthew Sakai 2023-11-16  974  	data_vio = get_available_data_vio(pool);
79535a7881c0cb Matthew Sakai 2023-11-16  975  	spin_unlock(&pool->lock);
79535a7881c0cb Matthew Sakai 2023-11-16 @976  	launch_bio(pool->completion.vdo, data_vio, bio);
79535a7881c0cb Matthew Sakai 2023-11-16  977  }
79535a7881c0cb Matthew Sakai 2023-11-16  978  

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