On Fri, Oct 11, 2013 at 10:25:23AM -0700, Sarah Sharp wrote: > Hi Xiao, > > I think you did something odd when you tried to send me the latest > revision of your patch "xhci: correct the usage of > USB_CTRL_SET_TIMEOUT". You sent this patch instead. On the plus side, > it looks like git-send-email works. > > Can you try again? Ah, nevermind, I saw the v2 patch you sent later. Sarah > On Fri, Oct 11, 2013 at 08:47:54AM +0800, xiao jin wrote: > > From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> > > > > If a command on the command ring needs to be cancelled before it is handled > > it can be turned to a no-op operation when the ring is stopped. > > We want to store the command ring enqueue pointer in the command structure > > when the command in enqueued for the cancellation case. > > > > Some commands used to store the command ring dequeue pointers instead of enqueue > > (these often worked because enqueue happends to equal dequeue quite often) > > > > Other commands correctly used the enqueue pointer but did not check if it pointed > > to a valid trb or a link trb, this caused for example stop endpoint command to timeout in > > xhci_stop_device() in about 2% of suspend/resume cases. > > > > This should also solve some weird behavior happening in command cancellation cases. > > > > This patch is based on a patch submitted by Sarah Sharp to linux-usb, but > > then forgotten: > > http://marc.info/?l=linux-usb&m=136269803207465&w=2 > > > > This patch should be backported to kernels as old as 3.7, that contain > > the commit b92cc66c047ff7cf587b318fe377061a353c120f "xHCI: add aborting > > command ring function" > > > > Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> > > Signed-off-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx> > > Cc: stable@xxxxxxxxxxxxxxx > > --- > > drivers/usb/host/xhci-hub.c | 2 +- > > drivers/usb/host/xhci-ring.c | 10 ++++++++++ > > drivers/usb/host/xhci.c | 25 +++++-------------------- > > drivers/usb/host/xhci.h | 1 + > > 4 files changed, 17 insertions(+), 21 deletions(-) > > > > diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c > > index fae697e..ccf0a06 100644 > > --- a/drivers/usb/host/xhci-hub.c > > +++ b/drivers/usb/host/xhci-hub.c > > @@ -287,7 +287,7 @@ static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend) > > if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue) > > xhci_queue_stop_endpoint(xhci, slot_id, i, suspend); > > } > > - cmd->command_trb = xhci->cmd_ring->enqueue; > > + cmd->command_trb = xhci_find_next_enqueue(xhci->cmd_ring); > > list_add_tail(&cmd->cmd_list, &virt_dev->cmd_list); > > xhci_queue_stop_endpoint(xhci, slot_id, 0, suspend); > > xhci_ring_cmd_db(xhci); > > diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c > > index aaa2906..9ac9672 100644 > > --- a/drivers/usb/host/xhci-ring.c > > +++ b/drivers/usb/host/xhci-ring.c > > @@ -123,6 +123,16 @@ static int enqueue_is_link_trb(struct xhci_ring *ring) > > return TRB_TYPE_LINK_LE32(link->control); > > } > > > > +union xhci_trb *xhci_find_next_enqueue(struct xhci_ring *ring) > > +{ > > + /* Enqueue pointer can be left pointing to the link TRB, > > + * we must handle that > > + */ > > + if (TRB_TYPE_LINK_LE32(ring->enqueue->link.control)) > > + return ring->enq_seg->next->trbs; > > + return ring->enqueue; > > +} > > + > > /* Updates trb to point to the next TRB in the ring, and updates seg if the next > > * TRB is in a new segment. This does not skip over link TRBs, and it does not > > * effect the ring dequeue or enqueue pointers. > > diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c > > index 49b6edb..1e36dbb 100644 > > --- a/drivers/usb/host/xhci.c > > +++ b/drivers/usb/host/xhci.c > > @@ -2598,15 +2598,7 @@ static int xhci_configure_endpoint(struct xhci_hcd *xhci, > > if (command) { > > cmd_completion = command->completion; > > cmd_status = &command->status; > > - command->command_trb = xhci->cmd_ring->enqueue; > > - > > - /* Enqueue pointer can be left pointing to the link TRB, > > - * we must handle that > > - */ > > - if (TRB_TYPE_LINK_LE32(command->command_trb->link.control)) > > - command->command_trb = > > - xhci->cmd_ring->enq_seg->next->trbs; > > - > > + command->command_trb = xhci_find_next_enqueue(xhci->cmd_ring); > > list_add_tail(&command->cmd_list, &virt_dev->cmd_list); > > } else { > > cmd_completion = &virt_dev->cmd_completion; > > @@ -2614,7 +2606,7 @@ static int xhci_configure_endpoint(struct xhci_hcd *xhci, > > } > > init_completion(cmd_completion); > > > > - cmd_trb = xhci->cmd_ring->dequeue; > > + cmd_trb = xhci_find_next_enqueue(xhci->cmd_ring); > > if (!ctx_change) > > ret = xhci_queue_configure_endpoint(xhci, in_ctx->dma, > > udev->slot_id, must_succeed); > > @@ -3439,14 +3431,7 @@ int xhci_discover_or_reset_device(struct usb_hcd *hcd, struct usb_device *udev) > > > > /* Attempt to submit the Reset Device command to the command ring */ > > spin_lock_irqsave(&xhci->lock, flags); > > - reset_device_cmd->command_trb = xhci->cmd_ring->enqueue; > > - > > - /* Enqueue pointer can be left pointing to the link TRB, > > - * we must handle that > > - */ > > - if (TRB_TYPE_LINK_LE32(reset_device_cmd->command_trb->link.control)) > > - reset_device_cmd->command_trb = > > - xhci->cmd_ring->enq_seg->next->trbs; > > + reset_device_cmd->command_trb = xhci_find_next_enqueue(xhci->cmd_ring); > > > > list_add_tail(&reset_device_cmd->cmd_list, &virt_dev->cmd_list); > > ret = xhci_queue_reset_device(xhci, slot_id); > > @@ -3650,7 +3635,7 @@ int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev) > > union xhci_trb *cmd_trb; > > > > spin_lock_irqsave(&xhci->lock, flags); > > - cmd_trb = xhci->cmd_ring->dequeue; > > + cmd_trb = xhci_find_next_enqueue(xhci->cmd_ring); > > ret = xhci_queue_slot_control(xhci, TRB_ENABLE_SLOT, 0); > > if (ret) { > > spin_unlock_irqrestore(&xhci->lock, flags); > > @@ -3785,7 +3770,7 @@ int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev) > > slot_ctx->dev_info >> 27); > > > > spin_lock_irqsave(&xhci->lock, flags); > > - cmd_trb = xhci->cmd_ring->dequeue; > > + cmd_trb = xhci_find_next_enqueue(xhci->cmd_ring); > > ret = xhci_queue_address_device(xhci, virt_dev->in_ctx->dma, > > udev->slot_id); > > if (ret) { > > diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h > > index 46aa148..f3e1020 100644 > > --- a/drivers/usb/host/xhci.h > > +++ b/drivers/usb/host/xhci.h > > @@ -1840,6 +1840,7 @@ int xhci_cancel_cmd(struct xhci_hcd *xhci, struct xhci_command *command, > > union xhci_trb *cmd_trb); > > void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, unsigned int slot_id, > > unsigned int ep_index, unsigned int stream_id); > > +union xhci_trb *xhci_find_next_enqueue(struct xhci_ring *ring); > > > > /* xHCI roothub code */ > > void xhci_set_link_state(struct xhci_hcd *xhci, __le32 __iomem **port_array, > > -- > > 1.7.1 > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
