From: George Cherian <[email protected]> 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. Cc: [email protected] # v3.2+ Signed-off-by: George Cherian <[email protected]> Signed-off-by: Felipe Balbi <[email protected]> --- Improved the comment in the driver a little bit. Also, Ccing stable. This should be backported as far back as possible. This bug exists since first version of the driver back in v3.2. 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..b5e5b35 100644 --- 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); } -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
