[PATCH 4.19 29/72] usb: dwc3: gadget: move requests to cancelled_list

Greg Kroah-Hartman
2019-07-02T08:06:19Z

commit d4f1afe5e896c18ae01099a85dab5e1a198bd2a8 upstream

Whenever we have a request in flight, we can move it to the cancelled
list and later simply iterate over that list and skip over any TRBs we
find.

Cc: Fei Yang <fei.yang@intel.com>
Cc: Sam Protsenko <semen.protsenko@linaro.org>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: linux-usb@vger.kernel.org
Cc: stable@vger.kernel.org # 4.19.y
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
(cherry picked from commit d4f1afe5e896c18ae01099a85dab5e1a198bd2a8)
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/usb/dwc3/gadget.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index c2169bc626c8..8291fa1624e1 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1364,6 +1364,17 @@ static void dwc3_gadget_ep_skip_trbs(struct dwc3_ep *dep, struct dwc3_request *r
}
}

+static void dwc3_gadget_ep_cleanup_cancelled_requests(struct dwc3_ep *dep)
+{
+ struct dwc3_request *req;
+ struct dwc3_request *tmp;
+
+ list_for_each_entry_safe(req, tmp, &dep->cancelled_list, list) {
+ dwc3_gadget_ep_skip_trbs(dep, req);
+ dwc3_gadget_giveback(dep, req, -ECONNRESET);
+ }
+}
+
static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
struct usb_request *request)
{
@@ -1400,8 +1411,9 @@ static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
if (!r->trb)
goto out0;

- dwc3_gadget_ep_skip_trbs(dep, r);
- goto out1;
+ dwc3_gadget_move_cancelled_request(req);
+ dwc3_gadget_ep_cleanup_cancelled_requests(dep);
+ goto out0;
}
dev_err(dwc->dev, "request %pK was not queued to %s\n",
request, ep->name);
@@ -1409,7 +1421,6 @@ static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
goto out0;
}

-out1:
dwc3_gadget_giveback(dep, req, -ECONNRESET);

out0:
--
2.20.1