[PATCH -next] cifs: Use GFP_ATOMIC when a lock is held in cifs_mount()

[YueHaibing <yuehaibing@xxxxxxxxxx>]

A spin lock is held before kstrndup, it may sleep with holding
the spinlock, so we should use GFP_ATOMIC instead.

Fixes: e58c31d5e387 ("cifs: Add support for failover in cifs_reconnect()")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 fs/cifs/connect.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index a83aa61..3d5e308 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -4574,7 +4574,8 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *vol)
 		tcon->remap = cifs_remap(cifs_sb);
 	}
 	cifs_sb->origin_fullpath = kstrndup(tcon->dfs_path,
-					    strlen(tcon->dfs_path), GFP_KERNEL);
+					    strlen(tcon->dfs_path),
+					    GFP_ATOMIC);
 	if (!cifs_sb->origin_fullpath) {
 		spin_unlock(&cifs_tcp_ses_lock);
 		rc = -ENOMEM;