[Devel] [PATCH RHEL8 COMMIT] ploop: Use kmap_atomic() instead of kmap()

[Konstantin Khorenko]

The commit is pushed to "branch-rh8-4.18.0-240.1.1.vz8.5.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh8-4.18.0-240.1.1.vz8.5.57
------>
commit 949b962dc29cc63754bfefe035b9786e09ec8488
Author: Kirill Tkhai <ktkhai at virtuozzo.com>
Date:   Mon Jul 19 15:41:31 2021 +0300

    ploop: Use kmap_atomic() instead of kmap()
    
    We need to use kmap_atomic() under write_lock.
    
    Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
---
 drivers/md/dm-ploop-cmd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/dm-ploop-cmd.c b/drivers/md/dm-ploop-cmd.c
index 14e7b06d88b5..b9be80492eae 100644
--- a/drivers/md/dm-ploop-cmd.c
+++ b/drivers/md/dm-ploop-cmd.c
@@ -1154,7 +1154,7 @@ static int ploop_check_delta_before_flip(struct ploop *ploop, struct file *file)
 	write_lock_irq(&ploop->bat_rwlock);
 	ploop_for_each_md_page(ploop, md, node) {
 		init_be_iter(size_in_clus, md->id, &i, &end);
-		d_bat_entries = kmap(d_md->page);
+		d_bat_entries = kmap_atomic(d_md->page);
 		for (; i <= end; i++) {
 			if (md_page_cluster_is_in_top_delta(ploop, md, i) &&
 			    d_bat_entries[i] != BAT_ENTRY_NONE) {
@@ -1170,7 +1170,7 @@ static int ploop_check_delta_before_flip(struct ploop *ploop, struct file *file)
 			goto unmap;
 		}
 unmap:
-		kunmap(d_md->page);
+		kunmap_atomic(d_bat_entries);
 		if (stop)
 			break;
 		d_md = md_next_entry(d_md);