usb: ci_udc: cosmetics: EP and requests debug info

Make a note in an unexpected situation, e.g. queuing a request
on a disabled endpoint, enabling an enabled endpoint...

Reviewed-by: Mattijs Korpershoek <mkorpershoek@kernel.org>
Signed-off-by: Petr Beneš <petr.benes@ysoft.com>
Link: https://lore.kernel.org/r/20251218142737.3169753-2-petr.benes@ysoft.com
Signed-off-by: Mattijs Korpershoek <mkorpershoek@kernel.org>

diff --git a/drivers/usb/gadget/ci_udc.c b/drivers/usb/gadget/ci_udc.c
index c8953d48723363100371bb1a091f7dd775c2f8e0..046bb335ecb5e5f341bed8ce2815466bbe6dfbed 100644 (file)
--- a/drivers/usb/gadget/ci_udc.c
+++ b/drivers/usb/gadget/ci_udc.c
@@ -273,8 +273,10 @@ ci_ep_alloc_request(struct usb_ep *ep, unsigned int gfp_flags)
        if (ci_ep->desc)
                num = ci_ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
 
-       if (num == 0 && controller.ep0_req)
+       if (num == 0 && controller.ep0_req) {
+               DBG("%s: already got controller.ep0_req = %p\n", __func__, controller.ep0_req);
                return &controller.ep0_req->req;
+       }
 
        ci_req = calloc(1, sizeof(*ci_req));
        if (!ci_req)
@@ -296,6 +298,8 @@ static void ci_ep_free_request(struct usb_ep *ep, struct usb_request *req)
 
        if (ci_ep->desc)
                num = ci_ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
+       else
+               DBG("%s: no endpoint %p descriptor\n", __func__, ci_ep);
 
        if (num == 0) {
                if (!controller.ep0_req)
@@ -624,8 +628,10 @@ static int ci_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
                        break;
        }
 
-       if (&ci_req->req != _req)
+       if (&ci_req->req != _req) {
+               DBG("%s: ci_req not found in the queue\n", __func__);
                return -EINVAL;
+       }
 
        list_del_init(&ci_req->queue);