[PATCH] usb:solve resume usb device identification problem

From	Pengcheng Li <lpc.li@hisilicon.com>
Newsgroups	linux.kernel
Subject	[PATCH] usb:solve resume usb device identification problem
Date	2016-07-11 15:10 +0200
Message-ID	<rTJ8d-7rE-15@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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A usb device in the connection state. Then host is suspend and resume.
But the usb device could not be at the right speed. We should be reset
the reset.

Signed-off-by: Pengcheng Li <lpc.li@hisilicon.com>
---
 drivers/usb/core/hub.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index bee1351..cd71bb3 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -3455,7 +3455,7 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
 	struct usb_hub	*hub = usb_hub_to_struct_hub(udev->parent);
 	struct usb_port *port_dev = hub->ports[udev->portnum  - 1];
 	int		port1 = udev->portnum;
-	int		status;
+	int		status, retval;
 	u16		portchange, portstatus;
 
 	if (!test_and_set_bit(port1, hub->child_usage_bits)) {
@@ -3512,6 +3512,10 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
 		}
 	}
 
+	retval = hub_port_reset(hub, port1, udev, HUB_ROOT_RESET_TIME, false);
+	if (retval < 0)
+		hub_port_disable(hub, port1, 0);
+
 	if (udev->persist_enabled)
 		status = wait_for_connected(udev, hub, &port1, &portchange,
 				&portstatus);
-- 
2.8.2

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[PATCH] usb:solve resume usb device identification problem Pengcheng Li <lpc.li@hisilicon.com> - 2016-07-11 15:10 +0200
  Re: [PATCH] usb:solve resume usb device identification problem Alan Stern <stern@rowland.harvard.edu> - 2016-07-11 17:00 +0200
    RE: [PATCH] usb:solve resume usb device identification problem Lipengcheng <lpc.li@hisilicon.com> - 2016-07-12 03:50 +0200
  Re: [PATCH] usb:solve resume usb device identification problem Lu Baolu <baolu.lu@linux.intel.com> - 2016-07-12 02:50 +0200
    RE: [PATCH] usb:solve resume usb device identification problem Lipengcheng <lpc.li@hisilicon.com> - 2016-07-12 04:00 +0200
      Re: [PATCH] usb:solve resume usb device identification problem Lu Baolu <baolu.lu@linux.intel.com> - 2016-07-12 04:30 +0200
        RE: [PATCH] usb:solve resume usb device identification problem Lipengcheng <lpc.li@hisilicon.com> - 2016-07-12 13:40 +0200

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