linux-kernel - drivers/md/raid10.c:995 wait

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Date:   Sun, 7 Feb 2021 20:35:46 +0800
From:   kernel test robot <lkp@...el.com>
To:     Vitaly Mayatskikh <vmayatskikh@...italocean.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Song Liu <songliubraving@...com>
Subject: drivers/md/raid10.c:995 wait_barrier() warn: if();

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   61556703b610a104de324e4f061dc6cf7b218b46
commit: fe630de009d0729584d79c78f43121e07c745fdc md/raid10: avoid deadlock on recovery.
date:   7 months ago
config: nds32-randconfig-m031-20210207 (attached as .config)
compiler: nds32le-linux-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

New smatch warnings:
drivers/md/raid10.c:995 wait_barrier() warn: if();
drivers/md/raid10.c:995 wait_barrier() warn: if();
drivers/md/raid10.c:995 wait_barrier() warn: ignoring unreachable code.

Old smatch warnings:
drivers/md/raid10.c:3220 raid10_sync_request() error: we previously assumed 'bio' could be null (see line 3212)
drivers/md/raid10.c:3225 raid10_sync_request() error: we previously assumed 'mreplace' could be null (see line 3111)
drivers/md/raid10.c:3575 calc_sectors() warn: should '1 << conf->geo.chunk_shift' be a 64 bit type?

vim +995 drivers/md/raid10.c

0a27ec96b6fb1ab NeilBrown         2006-01-06   978  
e879a8793f915aa NeilBrown         2011-10-11   979  static void wait_barrier(struct r10conf *conf)
0a27ec96b6fb1ab NeilBrown         2006-01-06   980  {
0a27ec96b6fb1ab NeilBrown         2006-01-06   981  	spin_lock_irq(&conf->resync_lock);
0a27ec96b6fb1ab NeilBrown         2006-01-06   982  	if (conf->barrier) {
fe630de009d0729 Vitaly Mayatskikh 2020-03-03   983  		struct bio_list *bio_list = current->bio_list;
0a27ec96b6fb1ab NeilBrown         2006-01-06   984  		conf->nr_waiting++;
d6b42dcb995e6ac NeilBrown         2012-03-19   985  		/* Wait for the barrier to drop.
d6b42dcb995e6ac NeilBrown         2012-03-19   986  		 * However if there are already pending
d6b42dcb995e6ac NeilBrown         2012-03-19   987  		 * requests (preventing the barrier from
d6b42dcb995e6ac NeilBrown         2012-03-19   988  		 * rising completely), and the
d6b42dcb995e6ac NeilBrown         2012-03-19   989  		 * pre-process bio queue isn't empty,
d6b42dcb995e6ac NeilBrown         2012-03-19   990  		 * then don't wait, as we need to empty
d6b42dcb995e6ac NeilBrown         2012-03-19   991  		 * that queue to get the nr_pending
d6b42dcb995e6ac NeilBrown         2012-03-19   992  		 * count down.
d6b42dcb995e6ac NeilBrown         2012-03-19   993  		 */
578b54ade8a5e04 NeilBrown         2016-11-14   994  		raid10_log(conf->mddev, "wait barrier");
d6b42dcb995e6ac NeilBrown         2012-03-19  @995  		wait_event_lock_irq(conf->wait_barrier,
d6b42dcb995e6ac NeilBrown         2012-03-19   996  				    !conf->barrier ||
0e5313e2d4ef93b Tomasz Majchrzak  2016-06-24   997  				    (atomic_read(&conf->nr_pending) &&
fe630de009d0729 Vitaly Mayatskikh 2020-03-03   998  				     bio_list &&
fe630de009d0729 Vitaly Mayatskikh 2020-03-03   999  				     (!bio_list_empty(&bio_list[0]) ||
fe630de009d0729 Vitaly Mayatskikh 2020-03-03  1000  				      !bio_list_empty(&bio_list[1]))) ||
fe630de009d0729 Vitaly Mayatskikh 2020-03-03  1001  				     /* move on if recovery thread is
fe630de009d0729 Vitaly Mayatskikh 2020-03-03  1002  				      * blocked by us
fe630de009d0729 Vitaly Mayatskikh 2020-03-03  1003  				      */
fe630de009d0729 Vitaly Mayatskikh 2020-03-03  1004  				     (conf->mddev->thread->tsk == current &&
fe630de009d0729 Vitaly Mayatskikh 2020-03-03  1005  				      test_bit(MD_RECOVERY_RUNNING,
fe630de009d0729 Vitaly Mayatskikh 2020-03-03  1006  					       &conf->mddev->recovery) &&
fe630de009d0729 Vitaly Mayatskikh 2020-03-03  1007  				      conf->nr_queued > 0),
eed8c02e680c04c Lukas Czerner     2012-11-30  1008  				    conf->resync_lock);
0a27ec96b6fb1ab NeilBrown         2006-01-06  1009  		conf->nr_waiting--;
0e5313e2d4ef93b Tomasz Majchrzak  2016-06-24  1010  		if (!conf->nr_waiting)
0e5313e2d4ef93b Tomasz Majchrzak  2016-06-24  1011  			wake_up(&conf->wait_barrier);
0a27ec96b6fb1ab NeilBrown         2006-01-06  1012  	}
0e5313e2d4ef93b Tomasz Majchrzak  2016-06-24  1013  	atomic_inc(&conf->nr_pending);
^1da177e4c3f415 Linus Torvalds    2005-04-16  1014  	spin_unlock_irq(&conf->resync_lock);
^1da177e4c3f415 Linus Torvalds    2005-04-16  1015  }
^1da177e4c3f415 Linus Torvalds    2005-04-16  1016  

:::::: The code at line 995 was first introduced by commit
:::::: d6b42dcb995e6acd7cc276774e751ffc9f0ef4bf md/raid1,raid10: avoid deadlock during resync/recovery.

:::::: TO: NeilBrown <neilb@...e.de>
:::::: CC: NeilBrown <neilb@...e.de>

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