we never allocate a TRB pool for physical endpoints
0 and 1 so trying to free it (a invalid TRB pool pointer)
will lead us in a warning while removing dwc3.ko module.
In order to fix the situation, all we have to do is skip
dwc3_free_trb_pool() for physical endpoints 0 and 1 just
as we while deleting endpoints from the endpoints list.
Signed-off-by: George Cherian <george.cherian@xxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
---
drivers/usb/dwc3/gadget.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 2b6e7e0..1c246f9 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1706,12 +1706,20 @@ static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
dep = dwc->eps[epnum];
if (!dep)
continue;
+ /*
+ * 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
+ * should these two operations otherwise we would end up with
+ * all sorts of bugs when removing dwc3.ko.
+ */
- dwc3_free_trb_pool(dep);
-
- if (epnum != 0 && epnum != 1)
+ if (epnum != 0 && epnum != 1) {
+ dwc3_free_trb_pool(dep);
list_del(&dep->endpoint.ep_list);
-
+ }
kfree(dep);
}
}
--
1.8.1.4
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