linux-kernel - [PATCH v3 3/4] erofs: relinquish volume with mutex held

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Message-Id: <20230209063913.46341-4-jefflexu@linux.alibaba.com>
Date:   Thu,  9 Feb 2023 14:39:12 +0800
From:   Jingbo Xu <jefflexu@...ux.alibaba.com>
To:     xiang@...nel.org, chao@...nel.org, linux-erofs@...ts.ozlabs.org,
        zhujia.zj@...edance.com
Cc:     huyue2@...lpad.com, linux-kernel@...r.kernel.org
Subject: [PATCH v3 3/4] erofs: relinquish volume with mutex held

Relinquish fscache volume with mutex held.  Otherwise if a new domain is
registered when the old domain with the same name gets removed from the
list but not relinquished yet, fscache may complain the collision.

Fixes: 8b7adf1dff3d ("erofs: introduce fscache-based domain")
Signed-off-by: Jingbo Xu <jefflexu@...ux.alibaba.com>
Reviewed-by: Jia Zhu <zhujia.zj@...edance.com>
---
 fs/erofs/fscache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index a302d6d23ab5..c6f09928b62c 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -326,8 +326,8 @@ static void erofs_fscache_domain_put(struct erofs_domain *domain)
 			kern_unmount(erofs_pseudo_mnt);
 			erofs_pseudo_mnt = NULL;
 		}
-		mutex_unlock(&erofs_domain_list_lock);
 		fscache_relinquish_volume(domain->volume, NULL, false);
+		mutex_unlock(&erofs_domain_list_lock);
 		kfree(domain->domain_id);
 		kfree(domain);
 		return;
-- 
2.19.1.6.gb485710b