[PATCH v2 1/2] usb: gadget: call usb_gadget_check_config() to verify UDC capability

[Frank Li]

The legacy gadget driver omitted calling usb_gadget_check_config()
to ensure that the USB device controller (UDC) has adequate resources,
including sufficient endpoint numbers and types, to support the given
configuration.

Previously, usb_add_config() was solely invoked by the legacy gadget
driver. Adds the necessary usb_gadget_check_config() after the bind()
operation to fix the issue.

Fixes: dce49449e04f ("usb: cdns3: allocate TX FIFO size according to composite EP number")
Reported-by: Ravi Gunasekaran <r-gunasekaran@xxxxxx>
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
---
change from v1 to v2
- not change for this patch, just add new patch to fix multi-config case

 drivers/usb/gadget/composite.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 403563c06477..cb0a4e2cdbb7 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -1029,6 +1029,10 @@ int usb_add_config(struct usb_composite_dev *cdev,
 		goto done;
 
 	status = bind(config);
+
+	if (status == 0)
+		status = usb_gadget_check_config(cdev->gadget);
+
 	if (status < 0) {
 		while (!list_empty(&config->functions)) {
 			struct usb_function		*f;
-- 
2.34.1