linux-kernel - [PATCH 3.12 22/82] xhci: Calculate old endpoints correctly on device reset

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Message-Id: <567ddd57e4aefd82a8a5a77c7ff53b122d7f34cb.1440407339.git.jslaby@suse.cz>
Date:	Mon, 24 Aug 2015 11:08:42 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Brian Campbell <bacam@...3.org.uk>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 22/82] xhci: Calculate old endpoints correctly on device reset

From: Brian Campbell <bacam@...3.org.uk>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

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@...3.org.uk>
Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/usb/host/xhci.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index e0ccc95c91e2..00686a8c4fa0 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -3423,6 +3423,9 @@ 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.
-- 
2.5.0

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