usb: dwc3: fix memory leak of dwc->regset

dwc->regset is allocated on dwc3_debugfs_init, and should
be released on init failure or dwc3_debugfs_exit. Btw,
The line "dwc->root = NULL" is unnecessary, so remove it.

Signed-off-by: Du, Changbin <changbin.du@intel.com>
[ felipe.balbi@linux.intel.com : add another err label for the new
	error condition ]

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/dwc3/debugfs.c b/drivers/usb/dwc3/debugfs.c
index 9ac37fe..cebf9e3 100644 (file)
--- a/drivers/usb/dwc3/debugfs.c
+++ b/drivers/usb/dwc3/debugfs.c
@@ -645,7 +645,7 @@ int dwc3_debugfs_init(struct dwc3 *dwc)
        file = debugfs_create_regset32("regdump", S_IRUGO, root, dwc->regset);
        if (!file) {
                ret = -ENOMEM;
-               goto err1;
+               goto err2;
        }
 
        if (IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)) {
@@ -653,7 +653,7 @@ int dwc3_debugfs_init(struct dwc3 *dwc)
                                dwc, &dwc3_mode_fops);
                if (!file) {
                        ret = -ENOMEM;
-                       goto err1;
+                       goto err2;
                }
        }
 
@@ -663,19 +663,22 @@ int dwc3_debugfs_init(struct dwc3 *dwc)
                                dwc, &dwc3_testmode_fops);
                if (!file) {
                        ret = -ENOMEM;
-                       goto err1;
+                       goto err2;
                }
 
                file = debugfs_create_file("link_state", S_IRUGO | S_IWUSR, root,
                                dwc, &dwc3_link_state_fops);
                if (!file) {
                        ret = -ENOMEM;
-                       goto err1;
+                       goto err2;
                }
        }
 
        return 0;
 
+err2:
+       kfree(dwc->regset);
+
 err1:
        debugfs_remove_recursive(root);
 
@@ -686,5 +689,5 @@ err0:
 void dwc3_debugfs_exit(struct dwc3 *dwc)
 {
        debugfs_remove_recursive(dwc->root);
-       dwc->root = NULL;
+       kfree(dwc->regset);
 }