Hi Ray,
Ray Chi wrote:
> Currently, when dwc3 handles request cancelled, dwc3 just returns
> -ECONNRESET for all requests. It will cause USB function drivers
> can't know if the requests are cancelled by other reasons.
>
> This patch will replace DWC3_REQUEST_STATUS_CANCELLED with the
> reasons below.
> - DWC3_REQUEST_STATUS_DISCONNECTED
> - DWC3_REQUEST_STATUS_DEQUEUED
> - DWC3_REQUEST_STATUS_STALLED
>
> Signed-off-by: Ray Chi <ray...@google.com>
> ---
> drivers/usb/dwc3/core.h | 12 +++++++-----
> drivers/usb/dwc3/gadget.c | 21 +++++++++++++++++----
> drivers/usb/dwc3/gadget.h | 6 ++++--
> 3 files changed, 28 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 4ca4b4be85e4..51a3eec2428a 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -908,11 +908,13 @@ struct dwc3_request {
> unsigned int remaining;
>
> unsigned int status;
> -#define DWC3_REQUEST_STATUS_QUEUED 0
> -#define DWC3_REQUEST_STATUS_STARTED 1
> -#define DWC3_REQUEST_STATUS_CANCELLED 2
> -#define DWC3_REQUEST_STATUS_COMPLETED 3
> -#define DWC3_REQUEST_STATUS_UNKNOWN -1
> +#define DWC3_REQUEST_STATUS_QUEUED 0
> +#define DWC3_REQUEST_STATUS_STARTED 1
> +#define DWC3_REQUEST_STATUS_DISCONNECTED 2
> +#define DWC3_REQUEST_STATUS_DEQUEUED 3
> +#define DWC3_REQUEST_STATUS_STALLED 4
> +#define DWC3_REQUEST_STATUS_COMPLETED 5
> +#define DWC3_REQUEST_STATUS_UNKNOWN -1
>
> u8 epnum;
> struct dwc3_trb *trb;
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index e1442fc763e1..b11fd02604bb 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -1402,7 +1402,7 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep
> *dep)
> dwc3_stop_active_transfer(dep, true, true);
>
> list_for_each_entry_safe(req, tmp, &dep->started_list, list)
> - dwc3_gadget_move_cancelled_request(req);
> + dwc3_gadget_move_cancelled_request(req,
> DWC3_REQUEST_STATUS_DEQUEUED);
>
> /* If ep isn't started, then there's no end transfer pending */
> if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
> @@ -1732,7 +1732,19 @@ static void
> dwc3_gadget_ep_cleanup_cancelled_requests(struct dwc3_ep *dep)
>
> list_for_each_entry_safe(req, tmp, &dep->cancelled_list, list) {
> dwc3_gadget_ep_skip_trbs(dep, req);
> - dwc3_gadget_giveback(dep, req, -ECONNRESET);
> + switch (req->status) {
> + case DWC3_REQUEST_STATUS_DISCONNECTED:
> + dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
> + break;
> + case DWC3_REQUEST_STATUS_DEQUEUED:
> + dwc3_gadget_giveback(dep, req, -ECONNRESET);
> + break;
> + case DWC3_REQUEST_STATUS_STALLED:
> + dwc3_gadget_giveback(dep, req, -EPIPE);
> + break;
> + default:
Also giveback the request for default case here, but with -ECONNRESET
and a dev_err() print here indicating driver bug. The rest of the patch
looks good.
Thanks,
Thinh
> + break;
> + }
> }
> }
>
> @@ -1776,7 +1788,8 @@ static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
> * cancelled.
> */
> list_for_each_entry_safe(r, t, &dep->started_list, list)
> - dwc3_gadget_move_cancelled_request(r);
> + dwc3_gadget_move_cancelled_request(r,
> + DWC3_REQUEST_STATUS_DEQUEUED);
>
> dep->flags &= ~DWC3_EP_WAIT_TRANSFER_COMPLETE;
>
> @@ -1848,7 +1861,7 @@ int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int
> value, int protocol)
> dwc3_stop_active_transfer(dep, true, true);
>
> list_for_each_entry_safe(req, tmp, &dep->started_list, list)
> - dwc3_gadget_move_cancelled_request(req);
> + dwc3_gadget_move_cancelled_request(req,
> DWC3_REQUEST_STATUS_STALLED);
>
> if (dep->flags & DWC3_EP_END_TRANSFER_PENDING) {
> dep->flags |= DWC3_EP_PENDING_CLEAR_STALL;
> diff --git a/drivers/usb/dwc3/gadget.h b/drivers/usb/dwc3/gadget.h
> index 0cd281949970..77df4b6d6c13 100644
> --- a/drivers/usb/dwc3/gadget.h
> +++ b/drivers/usb/dwc3/gadget.h
> @@ -90,15 +90,17 @@ static inline void
> dwc3_gadget_move_started_request(struct dwc3_request *req)
> /**
> * dwc3_gadget_move_cancelled_request - move @req to the cancelled_list
> * @req: the request to be moved
> + * @reason: cancelled reason for the dwc3 request
> *
> * Caller should take care of locking. This function will move @req from its
> * current list to the endpoint's cancelled_list.
> */
> -static inline void dwc3_gadget_move_cancelled_request(struct dwc3_request
> *req)
> +static inline void dwc3_gadget_move_cancelled_request(struct dwc3_request
> *req,
> + unsigned int reason)
> {
> struct dwc3_ep *dep = req->dep;
>
> - req->status = DWC3_REQUEST_STATUS_CANCELLED;
> + req->status = reason;
> list_move_tail(&req->list, &dep->cancelled_list);
> }
>
>
