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Duoming Zhou 4b6071087b usb: chipidea: fix deadlock in ci_otg_del_timer 
commit 7a58b8d602 upstream.

There is a deadlock in ci_otg_del_timer(), the process is
shown below:

    (thread 1)                  |        (thread 2)
ci_otg_del_timer()              | ci_otg_hrtimer_func()
  ...                           |
  spin_lock_irqsave() //(1)     |  ...
  ...                           |
  hrtimer_cancel()              |  spin_lock_irqsave() //(2)
  (block forever)

We hold ci->lock in position (1) and use hrtimer_cancel() to
wait ci_otg_hrtimer_func() to stop, but ci_otg_hrtimer_func()
also need ci->lock in position (2). As a result, the
hrtimer_cancel() in ci_otg_del_timer() will be blocked forever.

This patch extracts hrtimer_cancel() from the protection of
spin_lock_irqsave() in order that the ci_otg_hrtimer_func()
could obtain the ci->lock.

What`s more, there will be no race happen. Because the
"next_timer" is always under the protection of
spin_lock_irqsave() and we only check whether "next_timer"
equals to NUM_OTG_FSM_TIMERS in the following code.

Fixes: 3a316ec4c9 ("usb: chipidea: use hrtimer for otg fsm timers")
Cc: stable <stable@kernel.org>
Signed-off-by: Duoming Zhou <duoming@zju.edu.cn>
Link: https://lore.kernel.org/r/20220918033312.94348-1-duoming@zju.edu.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-11-25 17:40:26 +01:00
arch x86/cpu: Restore AMD's DE_CFG MSR after resume 2022-11-25 17:40:21 +01:00
block block: sed-opal: kmalloc the cmd/resp buffers 2022-11-25 17:40:23 +01:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-25 11:49:16 +02:00
crypto crypto: drbg - make reseeding from get_random_bytes() synchronous 2022-06-25 11:49:13 +02:00
Documentation x86/speculation: Add RSB VM Exit protections 2022-11-23 07:53:47 +01:00
drivers usb: chipidea: fix deadlock in ci_otg_del_timer 2022-11-25 17:40:26 +01:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:21:29 +01:00
fs cifs: Fix wrong return value checking when GETFLAGS 2022-11-25 17:40:25 +01:00
include vmlinux.lds.h: Fix placement of '.data..decrypted' section 2022-11-25 17:40:19 +01:00
init random: handle latent entropy and command line from random_init() 2022-06-25 11:49:11 +02:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-12-08 08:50:11 +01:00
kernel ring_buffer: Do not deactivate non-existant pages 2022-11-25 17:40:25 +01:00
lib dyndbg: let query-modname override actual module name 2022-10-26 13:19:31 +02:00
LICENSES
mm mm,hugetlb: take hugetlb_lock before decrementing h->resv_huge_pages 2022-11-03 23:52:29 +09:00
net net/x25: Fix skb leak in x25_lapb_receive_frame() 2022-11-25 17:40:24 +01:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-26 11:36:11 +01:00
scripts cert host tools: Stop complaining about deprecated OpenSSL functions 2022-11-25 17:40:20 +01:00
security capabilities: fix potential memleak on error path from vfs_getxattr_alloc() 2022-11-10 17:46:55 +01:00
sound ALSA: usb-audio: Drop snd_BUG_ON() from snd_usbmidi_output_open() 2022-11-25 17:40:25 +01:00
tools selftests/intel_pstate: fix build for ARCH=x86_64 2022-11-25 17:40:21 +01:00
usr initramfs: restore default compression behavior 2020-04-13 10:44:59 +02:00
virt KVM: arm64: vgic: Fix exit condition in scan_its_table() 2022-11-03 23:52:24 +09:00
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MAINTAINERS MAINTAINERS: co-maintain random.c 2022-06-25 11:49:01 +02:00
Makefile Linux 4.19.266 2022-11-23 07:53:47 +01:00
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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.