[Devel] [PATCH RHEL9 COMMIT] dm-ploop: drop redundant md_lock on md->status bits handling

[Konstantin Khorenko]

The commit is pushed to "branch-rh9-5.14.0-427.55.1.vz9.82.x-ovz" and will appear at git at bitbucket.org:openvz/vzkernel.git
after rh9-5.14.0-427.55.1.el9
------>
commit a9efb915cf9438c20f74a61b0733daf50794dc51
Author: Konstantin Khorenko <khorenko at virtuozzo.com>
Date:   Tue Jun 17 15:49:48 2025 +0300

    dm-ploop: drop redundant md_lock on md->status bits handling
    
    md->status bits are protected by ploop->bat_lock,
    md->md_lock is used to protect in-memory BAT copy, md->wait_llist in
    particular.
    
    Fixes: 1a12832fd864 ("dm-ploop: fix resize and grow to use the new way of updating md pages")
    Found while working on https://virtuozzo.atlassian.net/browse/VSTOR-107975
    
    Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>
    Reviewed-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
    Reviewed-by: Andrey Zhadchenko <andrey.zhadchenko at virtuozzo.com>
    
    Feature: dm-ploop: ploop target driver
---
 drivers/md/dm-ploop-map.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/md/dm-ploop-map.c b/drivers/md/dm-ploop-map.c
index e1a199f09c97f..11767dd919503 100644
--- a/drivers/md/dm-ploop-map.c
+++ b/drivers/md/dm-ploop-map.c
@@ -2727,16 +2727,13 @@ int ploop_prepare_reloc_index_wb(struct ploop *ploop,
 	err = -EIO;
 
 	spin_lock_irq(&ploop->bat_lock);
-	spin_lock(&md->md_lock);
 	/* Keep this test to be the same as in delay_if_md_busy */
 	if (test_bit(MD_WRITEBACK, &md->status) || test_bit(MD_UPDATING, &md->status)) {
 		err = -EBUSY;
-		spin_unlock(&md->md_lock);
 		goto out_error;
 	} else {
 		set_bit(MD_UPDATING, &md->status);
 	}
-	spin_unlock(&md->md_lock);
 
 	err = ploop_prepare_bat_update(ploop, md, type);
 	if (err)