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Filename Latest commit message Latest commit date
Stephan Gerhold 8d42643c6c phy: qcom-usb-hs: Fix extcon double register after power cycle 
[ Upstream commit 64f86b9978449ff05bfa6c64b4c5439e21e9c80b ]

Commit f0b5c2c963 ("phy: qcom-usb-hs: Replace the extcon API")
switched from extcon_register_notifier() to the resource-managed
API, i.e. devm_extcon_register_notifier().

This is problematic in this case, because the extcon notifier
is dynamically registered/unregistered whenever the PHY is powered
on/off. The resource-managed API does not unregister the notifier
until the driver is removed, so as soon as the PHY is power cycled,
attempting to register the notifier again results in:

	double register detected
	WARNING: CPU: 1 PID: 182 at kernel/notifier.c:26 notifier_chain_register+0x74/0xa0
	Call trace:
	 ...
	 extcon_register_notifier+0x74/0xb8
	 devm_extcon_register_notifier+0x54/0xb8
	 qcom_usb_hs_phy_power_on+0x1fc/0x208
	 ...

... and USB stops working after plugging the cable out and in
another time.

The easiest way to fix this is to make a partial revert of
commit f0b5c2c963 ("phy: qcom-usb-hs: Replace the extcon API")
and avoid using the resource-managed API in this case.

Fixes: f0b5c2c963 ("phy: qcom-usb-hs: Replace the extcon API")
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-12-31 16:44:29 +01:00
arch arm64: psci: Reduce the waiting time for cpu_psci_cpu_kill() 2019-12-31 16:44:21 +01:00
block
certs
crypto
Documentation
drivers phy: qcom-usb-hs: Fix extcon double register after power cycle 2019-12-31 16:44:29 +01:00
fs
include ipmi: Don't allow device module unload when in use 2019-12-31 16:44:14 +01:00
init
ipc
kernel bpf/stackmap: Fix deadlock with rq_lock in bpf_get_stack() 2019-12-31 16:44:09 +01:00
lib ubsan, x86: Annotate and allow __ubsan_handle_shift_out_of_bounds() in uaccess regions 2019-12-31 16:44:25 +01:00
LICENSES
mm
net Bluetooth: hci_core: fix init for HCI_USER_CHANNEL 2019-12-31 16:44:09 +01:00
samples
scripts
security
sound ASoC: soc-pcm: fixup dpcm_prune_paths() loop continue 2019-12-31 16:44:13 +01:00
tools ubsan, x86: Annotate and allow __ubsan_handle_shift_out_of_bounds() in uaccess regions 2019-12-31 16:44:25 +01:00
usr
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README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.