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Thomas Gleixner bf5cd0c632 genirq: Prevent chip buslock deadlock 
commit abc7e40c81 upstream.

If a interrupt chip utilizes chip->buslock then free_irq() can
deadlock in the following way:

CPU0				CPU1
				interrupt(X) (Shared or spurious)
free_irq(X)			interrupt_thread(X)
chip_bus_lock(X)
				   irq_finalize_oneshot(X)
				     chip_bus_lock(X)
synchronize_irq(X)

synchronize_irq() waits for the interrupt thread to complete,
i.e. forever.

Solution is simple: Drop chip_bus_lock() before calling
synchronize_irq() as we do with the irq_desc lock. There is nothing to
be protected after the point where irq_desc lock has been released.

This adds chip_bus_lock/unlock() to the remove_irq() code path, but
that's actually correct in the case where remove_irq() is called on
such an interrupt. The current users of remove_irq() are not affected
as none of those interrupts is on a chip which requires buslock.

Reported-by: Fredrik Markström <fredrik.markstrom@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-03-03 15:06:20 -08:00
..
cpu
sched, idle: Fix the idle polling state logic
2013-11-29 11:11:42 -08:00
debug
kdb: fix incorrect counts in KDB summary command output
2015-03-06 14:40:52 -08:00
events
ptrace: use fsuid, fsgid, effective creds for fs access checks
2016-02-25 11:57:47 -08:00
gcov
kernel/gcov: remove depends on CONFIG_EXPERIMENTAL
2013-01-11 11:39:33 -08:00
irq
genirq: Prevent chip buslock deadlock
2016-03-03 15:06:20 -08:00
power
PM / QoS: remove duplicate call to pm_qos_update_target
2015-03-18 13:22:28 +01:00
sched
printk: rename printk_sched to printk_deferred
2014-08-07 14:30:26 -07:00
time
ntp: Fixup adjtimex freq validation on 32-bit systems
2015-03-06 14:40:52 -08:00
trace
tracing: Have branch tracer use recursive field of task struct
2015-08-03 09:29:45 -07:00
.gitignore
kernel/hz.bc: ignore.
2013-04-22 07:09:06 -07:00
acct.c
fs: Fix hang with BSD accounting on frozen filesystem
2013-05-04 14:57:58 -04:00
async.c
async: rename and redefine async_func_ptr
2013-03-12 13:59:14 -07:00
audit_tree.c
audit: keep inode pinned
2014-11-21 09:22:52 -08:00
audit_watch.c
audit: catch possible NULL audit buffers
2013-01-11 14:54:55 -08:00
audit.c
CAPABILITIES: remove undefined caps from all processes
2014-09-17 09:03:57 -07:00
audit.h
audit: fix mq_open and mq_unlink to add the MQ root as a hidden parent audit_names record
2013-12-04 10:57:03 -08:00
auditfilter.c
auditfilter.c: fix kernel-doc warnings
2013-05-24 16:22:52 -07:00
auditsc.c
auditsc: audit_krule mask accesses need bounds checking
2014-06-16 13:42:53 -07:00
backtracetest.c
…
bounds.c
…
capability.c
CAPABILITIES: remove undefined caps from all processes
2014-09-17 09:03:57 -07:00
cgroup_freezer.c
cgroup: rename ->create/post_create/pre_destroy/destroy() to ->css_alloc/online/offline/free()
2012-11-19 08:13:38 -08:00
cgroup.c
move d_rcu from overlapping d_child to overlapping d_alias
2015-04-29 10:34:00 +02:00
compat.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal
2013-05-01 07:21:43 -07:00
configs.c
proc: Supply PDE attribute setting accessor functions
2013-05-01 17:29:18 -04:00
context_tracking.c
Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2013-06-20 08:18:35 -10:00
cpu_pm.c
…
cpu.c
sched: Fix hotplug vs. set_cpus_allowed_ptr()
2014-06-11 12:03:24 -07:00
cpuset.c
cpuset,mempolicy: fix sleeping function called from invalid context
2014-07-17 15:58:00 -07:00
crash_dump.c
…
cred.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2012-12-18 10:55:28 -08:00
delayacct.c
cputime: Use accessors to read task cputime stats
2013-01-27 19:23:31 +01:00
dma.c
…
elfcore.c
…
exec_domain.c
…
exit.c
introduce for_each_thread() to replace the buggy while_each_thread()
2014-10-05 14:54:15 -07:00
extable.c
extable: Flip the sorting message
2013-04-15 13:25:16 +02:00
fork.c
unshare: Unsharing a thread does not require unsharing a vm
2015-10-01 12:07:28 +02:00
freezer.c
freezer: Do not freeze tasks killed by OOM killer
2014-11-14 08:47:58 -08:00
futex_compat.c
ptrace: use fsuid, fsgid, effective creds for fs access checks
2016-02-25 11:57:47 -08:00
futex.c
futex: Drop refcount if requeue_pi() acquired the rtmutex
2016-02-25 11:57:49 -08:00
groups.c
userns: Don't allow setgroups until a gid mapping has been setablished
2015-01-08 09:58:16 -08:00
hrtimer.c
hrtimer: Set expiry time before switch_hrtimer_base()
2014-06-07 13:25:31 -07:00
hung_task.c
…
irq_work.c
Merge branch 'nohz/printk-v8' into irq/core
2013-02-05 00:48:46 +01:00
itimer.c
…
jump_label.c
…
kallsyms.c
kernel: kallsyms: memory override issue, need check destination buffer length
2013-04-15 15:17:26 +09:30
kcmp.c
ptrace: use fsuid, fsgid, effective creds for fs access checks
2016-02-25 11:57:47 -08:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
locking/mutex: Disable optimistic spinning on some architectures
2014-07-28 08:00:07 -07:00
Kconfig.preempt
…
kexec.c
PCI: Disable Bus Master only on kexec reboot
2013-12-20 07:45:08 -08:00
kmod.c
usermodehelper: check subprocess_info->path != NULL
2013-05-16 12:01:11 -07:00
kprobes.c
kprobes: Fix to free gone and unused optprobes
2013-05-28 10:37:59 +02:00
ksysfs.c
Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2012-12-11 18:10:49 -08:00
kthread.c
kthread: implement probe_kthread_data()
2013-04-30 17:04:02 -07:00
latencytop.c
…
lglock.c
…
lockdep_internals.h
…
lockdep_proc.c
lockdep: Use KSYM_NAME_LEN'ed buffer for __get_key_name()
2012-10-24 12:39:09 +02:00
lockdep_states.h
…
lockdep.c
Merge branch 'for-3.10/drivers' of git://git.kernel.dk/linux-block
2013-05-08 11:51:05 -07:00
Makefile
Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux
2013-05-05 10:58:06 -07:00
modsign_certificate.S
CONFIG_SYMBOL_PREFIX: cleanup.
2013-03-15 15:09:43 +10:30
modsign_pubkey.c
keys: use keyring_alloc() to create module signing keyring
2012-12-20 17:40:21 -08:00
module_signing.c
MODSIGN: Don't use enum-type bitfields in module signature info block
2012-12-05 11:27:24 +10:30
module-internal.h
MODSIGN: Move the magic string to the end of a module and eliminate the search
2012-10-19 17:30:40 -07:00
module.c
module: wrapper for symbol name.
2016-02-25 11:57:50 -08:00
mutex-debug.c
…
mutex-debug.h
…
mutex.c
mutex: Back out architecture specific check for negative mutex count
2013-04-19 09:33:36 +02:00
mutex.h
…
notifier.c
…
nsproxy.c
proc: Split the namespace stuff out into linux/proc_ns.h
2013-05-01 17:29:39 -04:00
padata.c
padata: use __this_cpu_read per-cpu helper
2012-12-06 17:16:23 +08:00
panic.c
dump_stack: implement arch-specific hardware description in task dumps
2013-04-30 17:04:02 -07:00
params.c
params: Fix potential memory leak in add_sysfs_param()
2013-03-18 11:40:21 +00:00
pid_namespace.c
pid_namespace: pidns_get() should check task_active_pid_ns() != NULL
2014-04-26 17:15:34 -07:00
pid.c
exit: pidns: alloc_pid() leaks pid_namespace if child_reaper is exiting
2015-01-08 09:58:17 -08:00
posix-cpu-timers.c
posix_timers: Fix pre-condition to stop the tick on full dynticks
2013-04-22 19:59:25 +02:00
posix-timers.c
posix-timers: Fix stack info leak in timer_create()
2014-11-14 08:48:00 -08:00
printk.c
console: Fix console name size mismatch
2015-04-19 10:10:51 +02:00
profile.c
proc: Supply PDE attribute setting accessor functions
2013-05-01 17:29:18 -04:00
ptrace.c
ptrace: use fsuid, fsgid, effective creds for fs access checks
2016-02-25 11:57:47 -08:00
range.c
range: Do not add new blank slot with add_range_with_merge
2013-06-18 11:32:10 -05:00
rcu.h
rcu: Provide RCU CPU stall warnings for tiny RCU
2013-01-28 22:06:21 -08:00
rcupdate.c
Merge branches 'doctorture.2013.01.29a', 'fixes.2013.01.26a', 'tagcb.2013.01.24a' and 'tiny.2013.01.29b' into HEAD
2013-01-28 22:25:21 -08:00
rcutiny_plugin.h
rcu: Provide RCU CPU stall warnings for tiny RCU
2013-01-28 22:06:21 -08:00
rcutiny.c
Merge branches 'doctorture.2013.01.29a', 'fixes.2013.01.26a', 'tagcb.2013.01.24a' and 'tiny.2013.01.29b' into HEAD
2013-01-28 22:25:21 -08:00
rcutorture.c
rcu: Allow rcutorture to be built at low optimization levels
2013-02-04 12:18:20 -08:00
rcutree_plugin.h
rcu: Don't allocate bootmem from rcu_init()
2013-05-15 10:41:12 -07:00
rcutree_trace.c
rcutrace: single_open() leaks
2013-05-05 00:16:35 -04:00
rcutree.c
rcu: Fix deadlock with CPU hotplug, RCU GP init, and timer migration
2013-06-10 13:37:12 -07:00
rcutree.h
rcu: Don't call wakeup() with rcu_node structure ->lock held
2013-06-10 13:37:11 -07:00
relay.c
Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block
2013-05-08 10:13:35 -07:00
res_counter.c
res_counter: return amount of charges after res_counter_uncharge()
2012-12-18 15:02:12 -08:00
resource.c
mem hotunplug: fix kfree() of bootmem memory
2013-04-29 15:54:40 -07:00
rtmutex_common.h
…
rtmutex-debug.c
sched/rt: Move rt specific bits into new header file
2013-02-07 20:51:08 +01:00
rtmutex-debug.h
rtmutex: Handle deadlock detection smarter
2014-07-17 15:58:04 -07:00
rtmutex-tester.c
locking/rtmutex/tester: Set correct permissions on sysfs files
2013-04-10 14:48:37 +02:00
rtmutex.c
rtmutex: Plug slow unlock race
2014-07-17 15:58:04 -07:00
rtmutex.h
rtmutex: Handle deadlock detection smarter
2014-07-17 15:58:04 -07:00
rwsem.c
Revert "rw_semaphore: remove up/down_read_non_owner"
2013-03-23 15:53:52 -07:00
seccomp.c
seccomp: allow BPF_XOR based ALU instructions.
2013-03-26 11:07:19 +11:00
semaphore.c
semaphore: use `bool' type for semaphore_waiter's up
2013-04-30 17:04:08 -07:00
signal.c
kernel/signal.c: unexport sigsuspend()
2016-02-19 14:22:37 -08:00
smp.c
kernel/smp.c:on_each_cpu_cond(): fix warning in fallback path
2014-09-17 09:03:57 -07:00
smpboot.c
smpboot: Add missing get_online_cpus() in smpboot_register_percpu_thread()
2015-02-11 14:48:17 +08:00
smpboot.h
…
softirq.c
revert "softirq: Add support for triggering softirq work on softirqs"
2015-05-17 09:51:33 -07:00
spinlock.c
…
srcu.c
srcu: use ACCESS_ONCE() to access sp->completed in srcu_read_lock()
2013-02-07 15:19:36 -08:00
stacktrace.c
…
stop_machine.c
stop_machine: Mark per cpu stopper enabled early
2013-02-26 22:25:17 +01:00
sys_ni.c
unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE
2013-05-09 13:46:38 -04:00
sys.c
reboot: rigrate shutdown/reboot to boot cpu
2013-06-12 16:29:44 -07:00
sysctl_binary.c
switch compat_sys_sysctl to COMPAT_SYSCALL_DEFINE
2013-05-09 14:53:20 -04:00
sysctl.c
perf: Enforce 1 as lower limit for perf_event_max_sample_rate
2014-06-11 12:03:27 -07:00
task_work.c
task_work: task_work_add() should not succeed after exit_task_work()
2012-09-13 16:47:34 +02:00
taskstats.c
taskstats: cgroupstats_user_cmd() may leak on error
2012-10-06 03:05:31 +09:00
test_kprobes.c
kernel/: rename random32() to prandom_u32()
2013-04-29 18:28:42 -07:00
time.c
time: settimeofday: Validate the values of tv from user
2015-01-29 17:40:56 -08:00
timeconst.bc
kernel: Replace timeconst.pl with a bc script
2013-02-16 23:17:25 +01:00
timer.c
timer: Prevent overflow in apply_slack
2014-06-07 13:25:30 -07:00
tracepoint.c
tracepoint: Do not waste memory on mods with no tracepoints
2014-05-30 21:52:11 -07:00
tsacct.c
cputime: Use accessors to read task cputime stats
2013-01-27 19:23:31 +01:00
uid16.c
groups: Consolidate the setgroups permission checks
2015-01-08 09:58:16 -08:00
up.c
…
user_namespace.c
userns: Allow setting gid_maps without privilege when setgroups is disabled
2015-01-08 09:58:17 -08:00
user-return-notifier.c
hlist: drop the node parameter from iterators
2013-02-27 19:10:24 -08:00
user.c
userns: Add a knob to disable setgroups on a per user namespace basis
2015-01-08 09:58:16 -08:00
utsname_sysctl.c
kernel/utsname_sysctl.c: put get/get_uts() into CONFIG_PROC_SYSCTL code block
2013-02-27 19:10:22 -08:00
utsname.c
proc: Split the namespace stuff out into linux/proc_ns.h
2013-05-01 17:29:39 -04:00
wait.c
propagate name change to comments in kernel source
2012-12-06 10:39:54 +01:00
watchdog.c
watchdog: Add comments to explain the watchdog_disabled variable
2013-03-14 08:24:05 +01:00
workqueue_internal.h
workqueue: include workqueue info when printing debug dump of a worker task
2013-04-30 17:04:02 -07:00
workqueue.c
workqueue: make sure delayed work run in local cpu
2015-10-27 09:44:50 +09:00