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authorBrian Campbell <bacam@z273.org.uk>2015-07-21 17:20:28 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-08-10 12:21:05 -0700
commit16da0ed9993056d465c4b55a9f6ee3cc19edfb70 (patch)
tree9c624397f80d60d5e4794295be1773c7627bbdf3 /drivers
parentfb101c8e329027bed11db4ec7f437d2e77433414 (diff)
xhci: Calculate old endpoints correctly on device reset
commit 326124a027abc9a7f43f72dc94f6f0f7a55b02b3 upstream. When resetting a device the number of active TTs may need to be corrected by xhci_update_tt_active_eps, but the number of old active endpoints supplied to it was always zero, so the number of TTs and the bandwidth reserved for them was not updated, and could rise unnecessarily. This affected systems using Intel's Patherpoint chipset, which rely on software bandwidth checking. For example, a Lenovo X230 would lose the ability to use ports on the docking station after enough suspend/resume cycles because the bandwidth calculated would rise with every cycle when a suitable device is attached. The correct number of active endpoints is calculated in the same way as in xhci_reserve_bandwidth. Signed-off-by: Brian Campbell <bacam@z273.org.uk> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/host/xhci.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 16f4f8dc1ae9..fc61e663b00a 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -3424,6 +3424,9 @@ int xhci_discover_or_reset_device(struct usb_hcd *hcd, struct usb_device *udev)
return -EINVAL;
}
+ if (virt_dev->tt_info)
+ old_active_eps = virt_dev->tt_info->active_eps;
+
if (virt_dev->udev != udev) {
/* If the virt_dev and the udev does not match, this virt_dev
* may belong to another udev.