kernel_optimize_test/drivers/usb
Tony Lindgren 407788b51d usb: musb: Fix host mode error -71 regression
Commit 467d5c9807 ("usb: musb: Implement session bit based runtime PM for
musb-core") started implementing musb generic runtime PM support by
introducing devctl register session bit based state control.

This caused a regression where if a USB mass storage device is connected
to a USB hub, we can get:

usb 1-1: reset high-speed USB device number 2 using musb-hdrc
usb 1-1: device descriptor read/64, error -71
usb 1-1.1: new high-speed USB device number 4 using musb-hdrc

This is because before the USB storage device is connected, musb is
in OTG_STATE_A_SUSPEND. And we currently only set need_finish_resume
in musb_stage0_irq() and the related code calling finish_resume_work
in musb_resume() and musb_runtime_resume() never gets called.

To fix the issue, we can call schedule_delayed_work() directly in
musb_stage0_irq() to have finish_resume_work run.

And we should no longer never get interrupts when when suspended.
We have changed musb to no longer need pm_runtime_irqsafe().
The need_finish_resume flag was added in commit 9298b4aad3 ("usb:
musb: fix device hotplug behind hub") and no longer applies as far
as I can tell. So let's just remove the earlier code that no longer
is needed.

Fixes: 467d5c9807 ("usb: musb: Implement session bit based runtime PM for musb-core")
Reported-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-01-25 11:02:29 +01:00
..
atm Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
c67x00
chipidea ktime: Get rid of the union 2016-12-25 17:21:22 +01:00
class USB: cdc-acm: add device id for GW Instek AFG-125 2016-12-05 16:32:51 +01:00
common usb: patches for v4.9 merge window 2016-09-14 20:37:50 +02:00
core USB: fix problems with duplicate endpoint addresses 2017-01-05 19:38:40 +01:00
dwc2 usb: dwc2: host: fix Wmaybe-uninitialized warning 2017-01-16 11:11:51 +02:00
dwc3 usb: dwc3: exynos fix axius clock error path to do cleanup 2017-01-12 10:03:59 +02:00
early treewide: remove redundant #include <linux/kconfig.h> 2016-10-11 15:06:33 -07:00
gadget usb: gadget: udc: atmel: remove memory leak 2017-01-12 10:05:04 +02:00
host xhci: remove WARN_ON if dma mask is not set for platform devices 2017-01-20 14:55:20 +01:00
image usb: microtek: Use "foo *bar" instead of "foo * bar". 2016-06-07 22:18:39 -07:00
isp1760 usb: Convert pr_warning to pr_warn 2016-11-03 10:38:36 +02:00
misc Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
mon Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
mtu3 usb: mtu3: fix U3 port link issue 2016-12-07 09:37:24 +01:00
musb usb: musb: Fix host mode error -71 regression 2017-01-25 11:02:29 +01:00
phy usb: twl6030-usb: make driver DT only 2016-11-18 13:54:44 +02:00
renesas_usbhs usb: renesas_usbhs: cleanup with list_first_entry_or_null() 2016-11-03 10:38:37 +02:00
serial USB: serial: ch341: fix control-message error handling 2017-01-11 12:08:57 +01:00
storage usb: storage: unusual_uas: Add JMicron JMS56x to unusual device 2017-01-05 19:24:55 +01:00
usbip usbip: fix warning in vhci_hcd_probe/lockdep_init_map 2016-12-06 08:37:41 +01:00
wusbcore wusbcore: Fix one more crypto-on-the-stack bug 2017-01-10 17:03:42 +01:00
Kconfig usb: Add MediaTek USB3 DRD driver 2016-10-27 17:02:41 +02:00
Makefile usb: Add MediaTek USB3 DRD driver 2016-10-27 17:02:41 +02:00
README
usb-skeleton.c usb: usb-skeleton: don't print on ENOMEM 2016-08-30 19:17:39 +02:00

To understand all the Linux-USB framework, you'll use these resources:

    * This source code.  This is necessarily an evolving work, and
      includes kerneldoc that should help you get a current overview.
      ("make pdfdocs", and then look at "usb.pdf" for host side and
      "gadget.pdf" for peripheral side.)  Also, Documentation/usb has
      more information.

    * The USB 2.0 specification (from www.usb.org), with supplements
      such as those for USB OTG and the various device classes.
      The USB specification has a good overview chapter, and USB
      peripherals conform to the widely known "Chapter 9".

    * Chip specifications for USB controllers.  Examples include
      host controllers (on PCs, servers, and more); peripheral
      controllers (in devices with Linux firmware, like printers or
      cell phones); and hard-wired peripherals like Ethernet adapters.

    * Specifications for other protocols implemented by USB peripheral
      functions.  Some are vendor-specific; others are vendor-neutral
      but just standardized outside of the www.usb.org team.

Here is a list of what each subdirectory here is, and what is contained in
them.

core/		- This is for the core USB host code, including the
		  usbfs files and the hub class driver ("hub_wq").

host/		- This is for USB host controller drivers.  This
		  includes UHCI, OHCI, EHCI, and others that might
		  be used with more specialized "embedded" systems.

gadget/		- This is for USB peripheral controller drivers and
		  the various gadget drivers which talk to them.


Individual USB driver directories.  A new driver should be added to the
first subdirectory in the list below that it fits into.

image/		- This is for still image drivers, like scanners or
		  digital cameras.
../input/	- This is for any driver that uses the input subsystem,
		  like keyboard, mice, touchscreens, tablets, etc.
../media/	- This is for multimedia drivers, like video cameras,
		  radios, and any other drivers that talk to the v4l
		  subsystem.
../net/		- This is for network drivers.
serial/		- This is for USB to serial drivers.
storage/	- This is for USB mass-storage drivers.
class/		- This is for all USB device drivers that do not fit
		  into any of the above categories, and work for a range
		  of USB Class specified devices. 
misc/		- This is for all USB device drivers that do not fit
		  into any of the above categories.