linux-kernel - drivers/md/dm-vdo/data-vio.c:969:2-8: preceding lock on line 966 (fwd)

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Date: Wed, 3 Apr 2024 12:47:23 -0400 (EDT)
From: Julia Lawall <julia.lawall@...ia.fr>
To: Mike Snitzer <snitzer@...nel.org>, Matthew Sakai <msakai@...hat.com>, 
    linux-kernel@...r.kernel.org, oe-kbuild-all@...ts.linux.dev
Subject: drivers/md/dm-vdo/data-vio.c:969:2-8: preceding lock on line 966
 (fwd)

Hello,

Please check whether the lock should be released before the returns.

julia

---------- Forwarded message ----------
Date: Wed, 3 Apr 2024 22:16:44 +0800
From: kernel test robot <lkp@...el.com>
To: oe-kbuild@...ts.linux.dev
Cc: lkp@...el.com, Julia Lawall <julia.lawall@...ia.fr>
Subject: drivers/md/dm-vdo/data-vio.c:969:2-8: preceding lock on line 966

BCC: lkp@...el.com
CC: oe-kbuild-all@...ts.linux.dev
CC: linux-kernel@...r.kernel.org
TO: Mike Snitzer <snitzer@...nel.org>
CC: Matthew Sakai <msakai@...hat.com>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   3e92c1e6cd876754b64d1998ec0a01800ed954a6
commit: f36b1d3ba533d21b5b793623f05761b0297d114e dm vdo: use a proper Makefile for dm-vdo
date:   6 weeks ago
:::::: branch date: 11 hours ago
:::::: commit date: 6 weeks ago
config: s390-randconfig-r052-20240403 (https://download.01.org/0day-ci/archive/20240403/202404032212.NV7EJ2Zj-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 13.2.0

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@...el.com>
| Reported-by: Julia Lawall <julia.lawall@...ia.fr>
| Closes: https://lore.kernel.org/r/202404032212.NV7EJ2Zj-lkp@intel.com/

cocci warnings: (new ones prefixed by >>)
>> drivers/md/dm-vdo/data-vio.c:969:2-8: preceding lock on line 966
   drivers/md/dm-vdo/data-vio.c:972:2-8: preceding lock on line 966

vim +969 drivers/md/dm-vdo/data-vio.c

79535a7881c0cb Matthew Sakai 2023-11-16  952
79535a7881c0cb Matthew Sakai 2023-11-16  953  /**
79535a7881c0cb Matthew Sakai 2023-11-16  954   * vdo_launch_bio() - Acquire a data_vio from the pool, assign the bio to it, and launch it.
79535a7881c0cb Matthew Sakai 2023-11-16  955   *
79535a7881c0cb Matthew Sakai 2023-11-16  956   * This will block if data_vios or discard permits are not available.
79535a7881c0cb Matthew Sakai 2023-11-16  957   */
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;
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

:::::: The code at line 969 was first introduced by commit
:::::: 79535a7881c0cbe95063a2670d840cc950ae9282 dm vdo: add data_vio, the request object which services incoming bios

:::::: TO: Matthew Sakai <msakai@...hat.com>
:::::: CC: Mike Snitzer <snitzer@...nel.org>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki