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authorSarah Sharp <sarah.a.sharp@linux.intel.com>2010-07-09 17:08:48 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2010-07-26 12:00:58 -0700
commit809cd1cb80d7dffe75dc94bc94ef2aab3dadc86a (patch)
treeaca1bb6dca0688eaf7ddaad1a528796bc7b59baa /drivers/usb/core
parentd1dc908a251c8cd87c1a1ad4f2c4a40cdbd8286c (diff)
USB: Fix USB3.0 Port Speed Downgrade after port reset
Without this fix, a USB 3.0 port is downgraded to full speed after a port reset of a configured device. The USB 3.0 terminations will be disabled permanently, and USB 3.0 devices will always enumerate as full speed devices, until the host controller is unplugged (if it is an ExpressCard) or the computer is rebooted. Fajun Chen traced this traced the speed downgrade issue to the port reset and the interpretation of port status in USB hub driver code. The hub code was not testing for the port being a SuperSpeed port, and it fell through to the else case of Full Speed. The following patch adds SuperSpeed mapping from the port status, and fixes the speed downgrade issue. Reported-by: Fajun Chen <fajun.chen@seagate.com> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core')
-rw-r--r--drivers/usb/core/hub.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 83e7bbbe97fa..70cccc75a362 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1982,6 +1982,8 @@ static int hub_port_wait_reset(struct usb_hub *hub, int port1,
(portstatus & USB_PORT_STAT_ENABLE)) {
if (hub_is_wusb(hub))
udev->speed = USB_SPEED_WIRELESS;
+ else if (portstatus & USB_PORT_STAT_SUPER_SPEED)
+ udev->speed = USB_SPEED_SUPER;
else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
udev->speed = USB_SPEED_HIGH;
else if (portstatus & USB_PORT_STAT_LOW_SPEED)