linux-kernel - [PATCH 1/6] usb: hub:Extend usb_hub_clear_tt

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Message-ID: <1556290206-9393-1-git-send-email-jilin@nvidia.com>
Date:   Fri, 26 Apr 2019 22:50:06 +0800
From:   Jim Lin <jilin@...dia.com>
To:     <linux-usb@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, Jim Lin <jilin@...dia.com>
Subject: [PATCH 1/6] usb: hub:Extend usb_hub_clear_tt_buffer parameter

Extend usb_hub_clear_tt_buffer parameter to specify device number
that will have the TT state of its hub cleared.

Signed-off-by: Jim Lin <jilin@...dia.com>
---
 drivers/usb/core/hub.c  | 5 +++--
 include/linux/usb/hcd.h | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 15a2934dc29d..4dec054c9776 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -840,6 +840,7 @@ int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
 /**
  * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
  * @urb: an URB associated with the failed or incomplete split transaction
+ * @devnum : device number that will have the TT state of its hub cleared
  *
  * High speed HCDs use this to tell the hub driver that some split control or
  * bulk transaction failed in a way that requires clearing internal state of
@@ -851,7 +852,7 @@ int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
  *
  * Return: 0 if successful. A negative error code otherwise.
  */
-int usb_hub_clear_tt_buffer(struct urb *urb)
+int usb_hub_clear_tt_buffer(struct urb *urb, int devnum)
 {
 	struct usb_device	*udev = urb->dev;
 	int			pipe = urb->pipe;
@@ -873,7 +874,7 @@ 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 |= devnum << 4;
 	clear->devinfo |= usb_pipecontrol(pipe)
 			? (USB_ENDPOINT_XFER_CONTROL << 11)
 			: (USB_ENDPOINT_XFER_BULK << 11);
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 695931b03684..01720f1f7d62 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -559,7 +559,7 @@ struct usb_tt_clear {
 	struct usb_host_endpoint	*ep;
 };
 
-extern int usb_hub_clear_tt_buffer(struct urb *urb);
+extern int usb_hub_clear_tt_buffer(struct urb *urb, int devnum);
 extern void usb_ep0_reinit(struct usb_device *);
 
 /* (shifted) direction/type/recipient from the USB 2.0 spec, table 9.2 */
-- 
2.1.4