diff options
| author |   Tony Lindgren <tony@atomide.com> | 2017-11-28 07:06:34 -0800 |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2017-11-28 07:06:34 -0800 |
| commit | 2db57789e6612ce0cf2fcbb577a1c8307b708566 (patch) | |
| tree | dd9f9e3dffabbf5cb932fcf5055ab329ca940fa0 /kernel/locking/rwsem.c | |
| parent | ARM: OMAP2+: Fix smatch found issue for omap_device (diff) | |
| parent | ARM: OMAP2+: Missing error code in omap_device_build() (diff) | |
Merge branch 'soc-fixes' into omap-for-v4.15/fixes
Diffstat (limited to 'kernel/locking/rwsem.c')
| -rw-r--r-- | kernel/locking/rwsem.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/kernel/locking/rwsem.c b/kernel/locking/rwsem.c index 4d48b1c4870d..f549c552dbf1 100644 --- a/kernel/locking/rwsem.c +++ b/kernel/locking/rwsem.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* kernel/rwsem.c: R/W semaphores, public implementation * * Written by David Howells (dhowells@redhat.com). @@ -28,6 +29,22 @@ void __sched down_read(struct rw_semaphore *sem) EXPORT_SYMBOL(down_read); +int __sched down_read_killable(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_killable)) { + rwsem_release(&sem->dep_map, 1, _RET_IP_); + return -EINTR; + } + + rwsem_set_reader_owned(sem); + return 0; +} + +EXPORT_SYMBOL(down_read_killable); + /* * trylock for reading -- returns 1 if successful, 0 if contention */ |