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c52804a472
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Sarah Sharp c52804a472 xhci: Avoid "dead ports", add roothub port polling. 
The USB core hub thread (khubd) is designed with external USB hubs in
mind.  It expects that if a port status change bit is set, the hub will
continue to send a notification through the hub status data transfer.
Basically, it expects hub notifications to be level-triggered.

The xHCI host controller is designed to be edge-triggered on the logical
'OR' of all the port status change bits.  When all port status change
bits are clear, and a new change bit is set, the xHC will generate a
Port Status Change Event.  If another change bit is set in the same port
status register before the first bit is cleared, it will not send
another event.

This means that the hub code may lose port status changes because of
race conditions between clearing change bits.  The user sees this as a
"dead port" that doesn't react to device connects.

The fix is to turn on port polling whenever a new change bit is set.
Once the USB core issues a hub status request that shows that no change
bits are set in any USB ports, turn off port polling.

We can't allow the USB core to poll the roothub for port events during
host suspend because if the PCI host is in D3cold, the port registers
will be all f's.  Instead, stop the port polling timer, and
unconditionally restart it when the host resumes.  If there are no port
change bits set after the resume, the first call to hub_status_data will
disable polling.

This patch should be backported to stable kernels with the first xHCI
support, 2.6.31 and newer, that include the commit
0f2a79300a "USB: xhci: Root hub support."
There will be merge conflicts because the check for HC_STATE_SUSPENDED
was moved into xhci_suspend in 3.8.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable@vger.kernel.org
2013-01-03 14:10:29 -08:00
..
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acpi Merge branch 'x86-acpi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-12-14 10:03:23 -08:00
amba Merge tag 'tegra-for-3.8-fixes-for-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/swarren/linux-tegra into fixes 2012-12-17 10:04:27 -08:00
ata 1) More ACPI fixes 2012-12-15 12:37:18 -08:00
atm solos-pci: ensure all TX packets are aligned to 4 bytes 2012-12-19 14:53:53 -08:00
auxdisplay
base vfs: turn is_dir argument to kern_path_create into a lookup_flags arg 2012-12-20 18:50:02 -05:00
bcma MTD pull for 3.8 2012-12-19 12:47:41 -08:00
block Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2012-12-20 14:00:13 -08:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2012-12-12 18:07:07 -08:00
bus ARM: OMAP: Fix drivers to depend on omap for internal devices 2012-12-16 15:23:37 -08:00
cdrom
char Some nice cleanups, and even a patch my wife did as a "live" demo for 2012-12-20 08:37:05 -08:00
clk MTD pull for 3.8 2012-12-19 12:47:41 -08:00
clocksource ARM: arm-soc: Updates for Marvell mvebu/kirkwood 2012-12-14 14:54:26 -08:00
connector
cpufreq ACPI and power management updates for 3.8-rc1 2012-12-11 12:45:35 -08:00
cpuidle ARM: arm-soc: SoC updates for 3.8 2012-12-12 12:05:15 -08:00
crypto Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-12-18 09:58:09 -08:00
dca
devfreq Merge branch 'pm-devfreq' 2012-12-07 23:13:36 +01:00
dio
dma dmatest: check for dma mapping error 2012-12-17 17:15:13 -08:00
edac Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2012-12-14 14:27:45 -08:00
eisa
extcon extcon pull request targetting Linux 3.8 for Greg KH on 2012.11.22 2012-11-27 06:44:10 -08:00
firewire Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-12-13 12:00:02 -08:00
firmware drivers/firmware/dmi_scan.c: fetch dmi version from SMBIOS if it exists 2012-12-20 17:40:19 -08:00
gpio gpio/mvebu-gpio: Make mvebu-gpio depend on OF_CONFIG 2012-12-19 22:15:14 +00:00
gpu Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2012-12-19 20:24:25 -08:00
hid Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2012-12-13 19:22:22 -08:00
hsi
hv
hwmon hwmon-vid: Add support for AMD family 11h to 15h processors 2012-12-19 22:17:02 +01:00
hwspinlock hwspinlock: remove use of __devexit 2012-11-28 11:41:36 -08:00
i2c Merge branch 'i2c-embedded/for-next' of git://git.pengutronix.de/git/wsa/linux 2012-12-18 16:51:10 -08:00
ide
idle cpuidle: Measure idle state durations with monotonic clock 2012-11-27 14:17:58 +01:00
iio This is the MFD patch set for the 3.8 merge window. 2012-12-16 18:55:20 -08:00
infiniband Second batch of InfiniBand/RDMA changes for 3.8: 2012-12-21 16:40:26 -08:00
input Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-12-19 12:56:42 -08:00
iommu IOMMU Updates for Linux v3.8 2012-12-20 10:07:25 -08:00
ipack TTY/Serial merge for 3.8-rc1 2012-12-11 14:08:47 -08:00
irqchip ARM: arm-soc: Device-tree updates, take 2 2012-12-14 14:42:53 -08:00
isdn mISDN: fix race in timer canceling on module unloading 2012-12-14 13:14:07 -05:00
leds Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds 2012-12-15 12:52:42 -08:00
lguest lguest: fix typo 2012-12-18 15:19:06 +10:30
macintosh Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-12-18 09:58:09 -08:00
md Miscellaneous device-mapper fixes, cleanups and performance improvements. 2012-12-21 17:08:06 -08:00
media Merge branches 'iommu/fixes', 'dma-debug', 'x86/amd', 'x86/vt-d', 'arm/tegra' and 'arm/omap' into next 2012-12-16 12:24:09 +01:00
memory
memstick
message drivers/message/fusion/mptscsih.c: missing break 2012-12-18 15:02:12 -08:00
mfd ARM: arm-soc fixes for 3.8 2012-12-20 07:21:54 -08:00
misc Merge git://www.linux-watchdog.org/linux-watchdog 2012-12-21 17:10:29 -08:00
mmc This is the MFD patch set for the 3.8 merge window. 2012-12-16 18:55:20 -08:00
mtd Nothing exciting, just clean-ups and nicification. Oh, and one small 2012-12-20 07:39:03 -08:00
net Second batch of InfiniBand/RDMA changes for 3.8: 2012-12-21 16:40:26 -08:00
nfc
nubus
of of: Fix export of of_find_matching_node_and_match() 2012-12-19 10:58:53 +00:00
oprofile
parisc
parport
pci Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2012-12-13 14:20:19 -08:00
pcmcia ARM: arm-soc: Header cleanups 2012-12-12 11:45:16 -08:00
pinctrl pinctrl: exynos5440/samsung: Staticize pcfgs 2012-12-18 19:00:25 -08:00
platform Corentin has moved 2012-12-17 17:15:14 -08:00
pnp Driver core updates for 3.8-rc1 2012-12-11 13:13:55 -08:00
power In part2: 2012-12-19 08:14:08 -08:00
pps
ps3
ptp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2012-12-12 18:07:07 -08:00
pwm pwm: Changes for v3.8-rc1 2012-12-19 08:19:07 -08:00
rapidio Driver core updates for 3.8-rc1 2012-12-11 13:13:55 -08:00
regulator Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-12-13 12:00:02 -08:00
remoteproc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-12-13 12:00:02 -08:00
rpmsg virtio: rpmsg: make it clear that virtqueue_add_buf() no longer returns > 0 2012-12-18 15:20:36 +10:30
rtc revert "rtc: recycle id when unloading a rtc driver" 2012-12-20 17:40:20 -08:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2012-12-13 14:20:19 -08:00
sbus
scsi Second batch of InfiniBand/RDMA changes for 3.8: 2012-12-21 16:40:26 -08:00
sfi
sh
sn
spi spi/sh-hspi: fix return value check in hspi_probe(). 2012-12-19 15:11:41 +00:00
ssb Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2012-12-14 14:27:45 -08:00
staging Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2012-12-17 15:44:47 -08:00
target Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2012-12-15 14:25:10 -08:00
tc
thermal Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-12-13 12:00:02 -08:00
tty Merge branch 'omap-for-v3.8/fixes-for-merge-window' into omap-for-v3.8/fixes-for-merge-window-v2 2012-12-16 11:28:10 -08:00
uio ARM: arm-soc: SoC updates for 3.8 2012-12-12 12:05:15 -08:00
usb xhci: Avoid "dead ports", add roothub port polling. 2013-01-03 14:10:29 -08:00
uwb
vfio vfio-pci: Enable device before attempting reset 2012-12-07 13:43:51 -07:00
vhost Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2012-12-15 14:25:10 -08:00
video backlight: locomolcd: fix checkpatch error and warning 2012-12-18 15:02:11 -08:00
virt Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-12-18 09:58:09 -08:00
virtio Some nice cleanups, and even a patch my wife did as a "live" demo for 2012-12-20 08:37:05 -08:00
vlynq
vme
w1 ARM: OMAP: Fix drivers to depend on omap for internal devices 2012-12-16 15:23:37 -08:00
watchdog watchdog: Orion: Fix possible null-deference in orion_wdt_probe 2012-12-19 22:25:10 +01:00
xen Feature: 2012-12-16 17:39:14 -08:00
zorro
Kconfig
Makefile