linux/kernel/locking
Roland Xu d33d26036a rtmutex: Drop rt_mutex::wait_lock before scheduling
rt_mutex_handle_deadlock() is called with rt_mutex::wait_lock held.  In the
good case it returns with the lock held and in the deadlock case it emits a
warning and goes into an endless scheduling loop with the lock held, which
triggers the 'scheduling in atomic' warning.

Unlock rt_mutex::wait_lock in the dead lock case before issuing the warning
and dropping into the schedule for ever loop.

[ tglx: Moved unlock before the WARN(), removed the pointless comment,
  	massaged changelog, added Fixes tag ]

Fixes: 3d5c9340d1 ("rtmutex: Handle deadlock detection smarter")
Signed-off-by: Roland Xu <mu001999@outlook.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/all/ME0P300MB063599BEF0743B8FA339C2CECC802@ME0P300MB0635.AUSP300.PROD.OUTLOOK.COM
2024-08-15 15:38:53 +02:00
..
Makefile
irqflag-debug.c
lock_events.c
lock_events.h
lock_events_list.h
lockdep.c lockdep: Fix lockdep_set_notrack_class() for CONFIG_LOCK_STAT 2024-08-07 08:31:10 -04:00
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
locktorture.c
mcs_spinlock.h
mutex-debug.c
mutex.c
mutex.h
osq_lock.c
percpu-rwsem.c
qrwlock.c
qspinlock.c
qspinlock_paravirt.h locking/pvqspinlock: Correct the type of "old" variable in pv_kick_node() 2024-07-29 12:16:21 +02:00
qspinlock_stat.h
rtmutex.c rtmutex: Drop rt_mutex::wait_lock before scheduling 2024-08-15 15:38:53 +02:00
rtmutex_api.c
rtmutex_common.h
rwbase_rt.c
rwsem.c
semaphore.c
spinlock.c
spinlock_debug.c
spinlock_rt.c
test-ww_mutex.c
ww_mutex.h
ww_rt_mutex.c