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This is the 5.4.88 stable release

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Merge 5.4.88 into android11-5.4-lts

Changes in 5.4.88
	Revert "drm/amd/display: Fix memory leaks in S3 resume"
	Revert "mtd: spinand: Fix OOB read"
	dmaengine: at_hdmac: Substitute kzalloc with kmalloc
	dmaengine: at_hdmac: add missing put_device() call in at_dma_xlate()
	dmaengine: at_hdmac: add missing kfree() call in at_dma_xlate()
	kdev_t: always inline major/minor helper functions
	iio:imu:bmi160: Fix alignment and data leak issues
	fuse: fix bad inode
	perf: Break deadlock involving exec_update_mutex
	rwsem: Implement down_read_killable_nested
	rwsem: Implement down_read_interruptible
	exec: Transform exec_update_mutex into a rw_semaphore
	mwifiex: Fix possible buffer overflows in mwifiex_cmd_802_11_ad_hoc_start
	Linux 5.4.88

Signed-off-by: Greg Kroah-Hartman <[email protected]>
Change-Id: I2e7792fc0001b7df699b4477fabf97914c0aeceb
This commit is contained in:
Greg Kroah-Hartman 2021-01-11 14:29:58 +01:00
commit 51e9c21c50
24 changed files with 211 additions and 103 deletions
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40
kernel/locking/rwsem.c
View file

@ -1370,6 +1370,18 @@ inline void __down_read(struct rw_semaphore *sem)
}
}
static inline int __down_read_interruptible(struct rw_semaphore *sem)
{
if (!rwsem_read_trylock(sem)) {
if (IS_ERR(rwsem_down_read_slowpath(sem, TASK_INTERRUPTIBLE)))
return -EINTR;
DEBUG_RWSEMS_WARN_ON(!is_rwsem_reader_owned(sem), sem);
} else {
rwsem_set_reader_owned(sem);
}
return 0;
}
static inline int __down_read_killable(struct rw_semaphore *sem)
{
if (!rwsem_read_trylock(sem)) {
@ -1520,6 +1532,20 @@ void __sched down_read(struct rw_semaphore *sem)
}
EXPORT_SYMBOL(down_read);
int __sched down_read_interruptible(struct rw_semaphore *sem)
{
might_sleep();
rwsem_acquire_read(&sem->dep_map, 0, 0, _RET_IP_);
if (LOCK_CONTENDED_RETURN(sem, __down_read_trylock, __down_read_interruptible)) {
rwsem_release(&sem->dep_map, 1, _RET_IP_);
return -EINTR;
}
return 0;
}
EXPORT_SYMBOL(down_read_interruptible);
int __sched down_read_killable(struct rw_semaphore *sem)
{
might_sleep();
@ -1632,6 +1658,20 @@ void down_read_nested(struct rw_semaphore *sem, int subclass)
}
EXPORT_SYMBOL(down_read_nested);
int down_read_killable_nested(struct rw_semaphore *sem, int subclass)
{
might_sleep();
rwsem_acquire_read(&sem->dep_map, subclass, 0, _RET_IP_);
if (LOCK_CONTENDED_RETURN(sem, __down_read_trylock, __down_read_killable)) {
rwsem_release(&sem->dep_map, 1, _RET_IP_);
return -EINTR;
}
return 0;
}
EXPORT_SYMBOL(down_read_killable_nested);
void _down_write_nest_lock(struct rw_semaphore *sem, struct lockdep_map *nest)
{
might_sleep();