On Thu, 16 May 2019, Jim Lin wrote:
> The Clear_TT_Buffer request sent to the hub includes the address of
> the LS/FS child device in wValue field. usb_hub_clear_tt_buffer()
> uses udev->devnum to set the address wValue. This won't work for
> devices connected to xHC.
>
> For other host controllers udev->devnum is the same as the address of
> the usb device, chosen and set by usb core. With xHC the controller
> hardware assigns the address, and won't be the same as devnum.
>
> Here we add devaddr in "struct usb_device" for
> usb_hub_clear_tt_buffer() to use.
>
> Signed-off-by: Jim Lin <jilin@xxxxxxxxxx>
> ---
Aside from the "xhci:" part of the Subject line (it's not really
appropriate because this is a modification of the USB core more than of
the xhci-hcd driver),
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> v2: xhci_clear_tt_buffer_complete: add static, shorter indentation
> , remove its claiming in xhci.h
> v3: Add description for clearing_tt (xhci.h)
> v4: Remove clearing_tt flag because hub_tt_work has hub->tt.lock
> to protect for Clear_TT_Buffer to be run serially.
> Remove xhci_clear_tt_buffer_complete as it's not necessary.
> Same reason as the above.
> Extend usb_hub_clear_tt_buffer parameter
> v5: Not extending usb_hub_clear_tt_buffer parameter
> Add description.
> v6: Remove unused parameter slot_id from xhci_clear_hub_tt_buffer
> v7: Add devaddr field in "struct usb_device"
> v8: split as two patches, change type from int to u8 for devaddr.
> v9: Use pahole to find place to put devaddr in struct usb_device.
> Remove space between type cast and variable.
> hub.c changed from v8
> clear->devinfo |= (u16) (udev->devaddr << 4);
> to
> clear->devinfo |= ((u16)udev->devaddr) << 4;
> to solve a problem if devaddr is larger than 16.
> v10 Initialize devaddr in xhci_setup_device()
> Move devaddr to be below "u8 level"
>
> drivers/usb/core/hub.c | 4 +++-
> drivers/usb/host/xhci.c | 1 +
> include/linux/usb.h | 2 ++
> 3 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index 15a2934dc29d..0d4b289be103 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -873,7 +873,7 @@ int usb_hub_clear_tt_buffer(struct urb *urb)
> /* info that CLEAR_TT_BUFFER needs */
> clear->tt = tt->multi ? udev->ttport : 1;
> clear->devinfo = usb_pipeendpoint (pipe);
> - clear->devinfo |= udev->devnum << 4;
> + clear->devinfo |= ((u16)udev->devaddr) << 4;
> clear->devinfo |= usb_pipecontrol(pipe)
> ? (USB_ENDPOINT_XFER_CONTROL << 11)
> : (USB_ENDPOINT_XFER_BULK << 11);
> @@ -2125,6 +2125,8 @@ static void update_devnum(struct usb_device *udev, int devnum)
> /* The address for a WUSB device is managed by wusbcore. */
> if (!udev->wusb)
> udev->devnum = devnum;
> + if (!udev->devaddr)
> + udev->devaddr = (u8)devnum;
> }
>
> static void hub_free_dev(struct usb_device *udev)
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index 7fa58c99f126..68b393e5a453 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -4096,6 +4096,7 @@ static int xhci_setup_device(struct usb_hcd *hcd, struct usb_device *udev,
> /* Zero the input context control for later use */
> ctrl_ctx->add_flags = 0;
> ctrl_ctx->drop_flags = 0;
> + udev->devaddr = (u8)(le32_to_cpu(slot_ctx->dev_state) & DEV_ADDR_MASK);
>
> xhci_dbg_trace(xhci, trace_xhci_dbg_address,
> "Internal device address = %d",
> diff --git a/include/linux/usb.h b/include/linux/usb.h
> index 4229eb74bd2c..af68e31118f8 100644
> --- a/include/linux/usb.h
> +++ b/include/linux/usb.h
> @@ -580,6 +580,7 @@ struct usb3_lpm_parameters {
> * @bus_mA: Current available from the bus
> * @portnum: parent port number (origin 1)
> * @level: number of USB hub ancestors
> + * @devaddr: device address, XHCI: assigned by HW, others: same as devnum
> * @can_submit: URBs may be submitted
> * @persist_enabled: USB_PERSIST enabled for this device
> * @have_langid: whether string_langid is valid
> @@ -663,6 +664,7 @@ struct usb_device {
> unsigned short bus_mA;
> u8 portnum;
> u8 level;
> + u8 devaddr;
>
> unsigned can_submit:1;
> unsigned persist_enabled:1;
>
