Hi,
On 12/29/2016 07:00 PM, Felipe Balbi wrote:
> COMP_SUCCESS should only be asserted on a *true* sucessful transfer. Any
> other cases are bogus and we should aim to catch them. One easy way to
> get bug reports is to trigger a WARN_ONCE() on such cases.
>
> Signed-off-by: Felipe Balbi <felipe.ba...@linux.intel.com>
> ---
> drivers/usb/host/xhci-ring.c | 28 +++++++++++++++-------------
> 1 file changed, 15 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
> index 17b878b53b46..772e07e2ef16 100644
> --- a/drivers/usb/host/xhci-ring.c
> +++ b/drivers/usb/host/xhci-ring.c
> @@ -1934,6 +1934,7 @@ static int process_ctrl_td(struct xhci_hcd *xhci,
> struct xhci_td *td,
> {
> struct xhci_virt_device *xdev;
> struct xhci_ring *ep_ring;
> + struct device *dev;
> unsigned int slot_id;
> int ep_index;
> struct xhci_ep_ctx *ep_ctx;
> @@ -1950,15 +1951,15 @@ static int process_ctrl_td(struct xhci_hcd *xhci,
> struct xhci_td *td,
> trb_comp_code = GET_COMP_CODE(le32_to_cpu(event->transfer_len));
> requested = td->urb->transfer_buffer_length;
> remaining = EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
> + dev = xhci_to_hcd(xhci)->self.controller;
>
> switch (trb_comp_code) {
> case COMP_SUCCESS:
> - if (trb_type != TRB_STATUS) {
> - xhci_warn(xhci, "WARN: Success on ctrl %s TRB without
> IOC set?\n",
> - (trb_type == TRB_DATA) ? "data" :
> "setup");
> - *status = -ESHUTDOWN;
> - break;
> - }
> + dev_WARN_ONCE(dev, trb_type != TRB_STATUS,
> + "ep%d%s: unexpected success! TRB Type %d\n",
> + usb_endpoint_num(&td->urb->ep->desc),
> + usb_endpoint_dir_in(&td->urb->ep->desc) ?
> + "in" : "out", trb_type);
> *status = 0;
Still setting status to 0 even "trb_type != TRB_STATUS"?
Previous code set it to -ESHUTDOWN.
> break;
> case COMP_SHORT_PACKET:
> @@ -2150,6 +2151,7 @@ static int process_bulk_intr_td(struct xhci_hcd *xhci,
> struct xhci_td *td,
> struct xhci_virt_ep *ep, int *status)
> {
> struct xhci_ring *ep_ring;
> + struct device *dev;
> u32 trb_comp_code;
> u32 remaining, requested, ep_trb_len;
>
> @@ -2158,16 +2160,16 @@ static int process_bulk_intr_td(struct xhci_hcd
> *xhci, struct xhci_td *td,
> remaining = EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
> ep_trb_len = TRB_LEN(le32_to_cpu(ep_trb->generic.field[2]));
> requested = td->urb->transfer_buffer_length;
> + dev = xhci_to_hcd(xhci)->self.controller;
>
> switch (trb_comp_code) {
> case COMP_SUCCESS:
> - /* handle success with untransferred data as short packet */
> - if (ep_trb != td->last_trb || remaining) {
> - xhci_warn(xhci, "WARN Successful completion on short
> TX\n");
> - xhci_dbg(xhci, "ep %#x - asked for %d bytes, %d bytes
> untransferred\n",
> - td->urb->ep->desc.bEndpointAddress,
> - requested, remaining);
> - }
> + dev_WARN_ONCE(dev, (ep_trb != td->last_trb) || remaining,
> + "ep%d%s: unexpected success! TRB %p/%p size
> %d/%d\n",
> + usb_endpoint_num(&td->urb->ep->desc),
> + usb_endpoint_dir_in(&td->urb->ep->desc) ?
> + "in" : "out", ep_trb, td->last_trb, remaining,
> + requested);
> *status = 0;
The same consideration here.
Best regards,
Lu Baolu
> break;
> case COMP_SHORT_PACKET:
--
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