Patchwork [3.5.y.z,extended,stable] Patch "USB: Handle auto-transition from hot to warm reset." has been added to staging queue

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Submitter Herton Ronaldo Krzesinski
Date Jan. 23, 2013, 4:41 a.m.
Message ID <>
Download mbox | patch
Permalink /patch/214731/
State New
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Herton Ronaldo Krzesinski - Jan. 23, 2013, 4:41 a.m.
This is a note to let you know that I have just added a patch titled

    USB: Handle auto-transition from hot to warm reset.

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



From a6bc5e28933bb3e88fd82d75615e64df25af5097 Mon Sep 17 00:00:00 2001
From: Sarah Sharp <>
Date: Wed, 14 Nov 2012 15:58:52 -0800
Subject: [PATCH] USB: Handle auto-transition from hot to warm reset.

commit 1c7439c61fa6516419c32a9824976334ea969d47 upstream.

USB 3.0 hubs and roothubs will automatically transition a failed hot
reset to a warm (BH) reset.  In that case, the warm reset change bit
will be set, and the link state change bit may also be set.  Change
hub_port_finish_reset to unconditionally clear those change bits for USB
3.0 hubs.  If these bits are not cleared, we may lose port change events
from the roothub.

This commit should be backported to kernels as old as 3.2, that contain
the commit 75d7cf72ab9fa01dc70877aa5c68e8ef477229dc "usbcore: refine
warm reset logic".

Signed-off-by: Sarah Sharp <>
Acked-by: Alan Stern <>
Signed-off-by: Herton Ronaldo Krzesinski <>
 drivers/usb/core/hub.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)



diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index f04ca3c..931eea2 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2471,16 +2471,16 @@  static void hub_port_finish_reset(struct usb_hub *hub, int port1,
 				port1, USB_PORT_FEAT_C_RESET);
 		/* FIXME need disconnect() for NOTATTACHED device */
-		if (warm) {
+		if (hub_is_superspeed(hub->hdev)) {
 			clear_port_feature(hub->hdev, port1,
 			clear_port_feature(hub->hdev, port1,
-		} else {
+		}
+		if (!warm)
 			usb_set_device_state(udev, *status
-		}