test_firmware: fix missing unlock on error in config_num_requests_store()

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")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/test_firmware.c b/lib/test_firmware.c
index 1e907dd3b4fe..078a61480573 100644
--- a/lib/test_firmware.c
+++ b/lib/test_firmware.c
@@ -371,6 +371,7 @@ static ssize_t config_num_requests_store(struct device *dev,
         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);