usb: dwc3: gadget: free trb pool only from epnum 2

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / dwc3 / gadget.c

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 2b6e7e0012071259464c1db3acf6c54b55e5971e..b5e5b35df49c8ff49ca5817ced0838e79dad9ccf 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1706,11 +1706,19 @@ static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
                dep = dwc->eps[epnum];
                if (!dep)
                        continue;
-
-               dwc3_free_trb_pool(dep);
-
-               if (epnum != 0 && epnum != 1)
+               /*
+                * Physical endpoints 0 and 1 are special; they form the
+                * bi-directional USB endpoint 0.
+                *
+                * For those two physical endpoints, we don't allocate a TRB
+                * pool nor do we add them the endpoints list. Due to that, we
+                * shouldn't do these two operations otherwise we would end up
+                * with all sorts of bugs when removing dwc3.ko.
+                */
+               if (epnum != 0 && epnum != 1) {
+                       dwc3_free_trb_pool(dep);
                        list_del(&dep->endpoint.ep_list);
+               }
 
                kfree(dep);
        }