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raid5-cache: fix lockdep warning 

lockdep reports warning of the rcu_dereference usage. Using normal rdev
access pattern to avoid the warning.

Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Shaohua Li 2016-11-16 17:20:19 -08:00
parent 6119e6792b
commit 354b445b5f
1 changed files with 14 additions and 2 deletions
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16
drivers/md/raid5-cache.c
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@ -970,16 +970,28 @@ static int r5l_recovery_flush_one_stripe(struct r5l_log *log,
continue;
/* in case device is broken */
rcu_read_lock();
rdev = rcu_dereference(conf->disks[disk_index].rdev);
if (rdev)
if (rdev) {
atomic_inc(&rdev->nr_pending);
rcu_read_unlock();
sync_page_io(rdev, stripe_sect, PAGE_SIZE,
sh->dev[disk_index].page, REQ_OP_WRITE, 0,
false);
rdev_dec_pending(rdev, rdev->mddev);
rcu_read_lock();
}
rrdev = rcu_dereference(conf->disks[disk_index].replacement);
if (rrdev)
if (rrdev) {
atomic_inc(&rrdev->nr_pending);
rcu_read_unlock();
sync_page_io(rrdev, stripe_sect, PAGE_SIZE,
sh->dev[disk_index].page, REQ_OP_WRITE, 0,
false);
rdev_dec_pending(rrdev, rrdev->mddev);
rcu_read_lock();
}
rcu_read_unlock();
}
raid5_release_stripe(sh);
return 0;