[PATCH 4.15 52/55] test_firmware: fix missing unlock on error in config_num_requests_store()

[Greg Kroah-Hartman]

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Wei Yongjun <weiyongj...@huawei.com>

commit a5e1923356505e46476c2fb518559b7a4d9d25b1 upstream.

Add the missing unlock before return from function
config_num_requests_store() in the error handling case.

Fixes: c92316bf8e94 ("test_firmware: add batched firmware tests")
Signed-off-by: Wei Yongjun <weiyongj...@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 lib/test_firmware.c |    1 +
 1 file changed, 1 insertion(+)

--- a/lib/test_firmware.c
+++ b/lib/test_firmware.c
@@ -371,6 +371,7 @@ static ssize_t config_num_requests_store
        if (test_fw_config->reqs) {
                pr_err("Must call release_all_firmware prior to changing 
config\n");
                rc = -EINVAL;
+               mutex_unlock(&test_fw_mutex);
                goto out;
        }
        mutex_unlock(&test_fw_mutex);