linux/drivers/usb/core
Dan Williams e3d1050555 usb: fix hub-port pm_runtime_enable() vs runtime pm transitions
Commit 9262c19d14 "usb: disable port power control if not supported in
wHubCharacteristics" gated enabling runtime pm for usb_port devices on
whether the parent hub supports power control, which causes a
regression.  The port must still be allowed to carry out runtime pm
callbacks and receive a -EAGAIN or -EBUSY result.  Otherwise the
usb_port device will transition to the pm error state and trigger the
same for the child usb_device.

Prior to the offending commit usb_hub_create_port_device() arranged for
runtime pm to be disabled is dev_pm_qos_expose_flags() failed.  Instead,
force the default state of PM_QOS_FLAG_NO_POWER_OFF flag to be set prior
to enabling runtime pm.  If that policy can not be set then fail
registration.

Report: http://marc.info/?l=linux-usb&m=140290586301336&w=2
Fixes: 9262c19d14 ("usb: disable port power control if not supported in wHubCharacteristics")
Reported-by: Bjørn Mork <bjorn@mork.no>
Reported-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-06-17 17:04:39 -07:00
..
Kconfig usb: common: rename phy-fsm-usb.c to usb-otg-fsm.c 2014-05-27 15:29:44 -07:00
Makefile USB: core: remove CONFIG_USB_DEBUG usage 2013-12-21 16:01:00 -08:00
buffer.c USB: core: correct spelling mistakes in comments and warning 2014-01-07 16:17:40 -08:00
config.c Merge 3.14-rc6 into usb-next 2014-03-12 11:40:15 -07:00
devices.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
devio.c USB patches for 3.15-rc1 2014-04-01 17:06:09 -07:00
driver.c USB: Avoid runtime suspend loops for HCDs that can't handle suspend/resume 2014-05-24 04:06:00 +09:00
endpoint.c USB: core: be specific about attribute permissions 2013-08-25 15:12:03 -07:00
file.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-11-13 15:34:18 +09:00
generic.c staging: usbip: convert usbip-host driver to usb_device_driver 2014-02-07 10:54:30 -08:00
hcd-pci.c usb: remove redundant D0 power state set 2014-05-27 15:18:48 -07:00
hcd.c usb: introduce port status lock 2014-05-27 16:51:50 -07:00
hub.c usb: fix hub-port pm_runtime_enable() vs runtime pm transitions 2014-06-17 17:04:39 -07:00
hub.h usb: fix hub-port pm_runtime_enable() vs runtime pm transitions 2014-06-17 17:04:39 -07:00
message.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2014-04-02 16:23:38 -07:00
notify.c usb: Add export.h for EXPORT_SYMBOL/THIS_MODULE where needed 2011-10-31 19:31:25 -04:00
otg_whitelist.h
port.c usb: fix hub-port pm_runtime_enable() vs runtime pm transitions 2014-06-17 17:04:39 -07:00
quirks.c usb: Add device quirk for Logitech HD Pro Webcams C920 and C930e 2014-03-07 11:46:51 -08:00
sysfs.c USB: core: correct spelling mistakes in comments and warning 2014-01-07 16:17:40 -08:00
urb.c Merge branch 'master' into for-next 2014-02-20 14:54:28 +01:00
usb-acpi.c usb: find internal hub tier mismatch via acpi 2014-05-27 16:38:52 -07:00
usb.c drivers: usb: core: {file,hub,sysfs,usb}.c: Whitespace fixes 2013-10-11 17:02:37 -07:00
usb.h usb: hub_handle_remote_wakeup() depends on CONFIG_PM_RUNTIME=y 2014-05-27 16:51:51 -07:00