[lvc-project] [PATCH 5.10 2/2] hugetlbfs: fix hugetlbfs_statfs() locking

[Mikhail Ukhin]

Commit 4b25f030ae69ba710eff587cabb4c57cb7e7a8a1 upstream.

After commit db71ef7 ("hugetlb: make free_huge_page irq safe"), the
subpool lock should be locked with spin_lock_irq() and all call sites was
modified as such, except for the ones in hugetlbfs_statfs().

Link: https://lkml.kernel.org/r/20220429202207.3045-1-almasrymina@google.com
Fixes: db71ef7 ("hugetlb: make free_huge_page irq safe")
Signed-off-by: Mina Almasry <almasrymina at google.com>
Reviewed-by: Mike Kravetz <mike.kravetz at oracle.com>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Mikhail Ukhin <mish.uxin2012 at yandex.ru>
---
---
 fs/hugetlbfs/inode.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index bf3cda498962..b6440007116e 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -1069,12 +1069,12 @@ static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf)
                 if (sbinfo->spool) {
                         long free_pages;
 
- spin_lock(&sbinfo->spool->lock);
+ spin_lock_irq(&sbinfo->spool->lock);
                         buf->f_blocks = sbinfo->spool->max_hpages;
                         free_pages = sbinfo->spool->max_hpages
                                 - sbinfo->spool->used_hpages;
                         buf->f_bavail = buf->f_bfree = free_pages;
- spin_unlock(&sbinfo->spool->lock);
+ spin_unlock_irq(&sbinfo->spool->lock);
                         buf->f_files = sbinfo->max_inodes;
                         buf->f_ffree = sbinfo->free_inodes;
                 }
-- 
2.25.1