fs: 9p: fix v9fs_file_open writeback fid error check

IS_ERR() and PTR_ERR() use wrong pointer, it should be
writeback_fid, fix it.

Link: http://lkml.kernel.org/r/20210330130632.1054357-1-yangyingliang@huawei.com
Fixes: 5bfe97d7382b ("9p: Fix writeback fid incorrectly being attached to dentry")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
[Dominique: adjusted commit summary]
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>

diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index 649f04f..59c32c9 100644 (file)
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -86,8 +86,8 @@ int v9fs_file_open(struct inode *inode, struct file *file)
                 * to work.
                 */
                writeback_fid = v9fs_writeback_fid(file_dentry(file));
-               if (IS_ERR(fid)) {
-                       err = PTR_ERR(fid);
+               if (IS_ERR(writeback_fid)) {
+                       err = PTR_ERR(writeback_fid);
                        mutex_unlock(&v9inode->v_mutex);
                        goto out_error;
                }