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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-09 10:47:50 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-09 10:47:50 -0700 |
| commit | c8b2ba83fb01336f094226895087b644df0ec397 (patch) | |
| tree | 2f3daeaf155b12bf50137efbdc5c764eb314a716 | |
| parent | 7cb328c30a71a450278031f932d2134c11165f4c (diff) | |
| parent | 5671360f29c68d9079914438f6a0109ef62f82a8 (diff) | |
| download | linux-c8b2ba83fb01336f094226895087b644df0ec397.tar.gz linux-c8b2ba83fb01336f094226895087b644df0ec397.tar.bz2 linux-c8b2ba83fb01336f094226895087b644df0ec397.zip | |
Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking fixes from Thomas Gleixner:
- Fix the EINTR logic in rwsem-spinlock to avoid double locking by a
writer and a reader
- Add a missing include to qspinlocks
* 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
locking/qspinlock: Explicitly include asm/prefetch.h
locking/rwsem-spinlock: Fix EINTR branch in __down_write_common()
| -rw-r--r-- | kernel/locking/qspinlock.c | 1 | ||||
| -rw-r--r-- | kernel/locking/rwsem-spinlock.c | 4 |
2 files changed, 3 insertions, 2 deletions
diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c index b2caec7315af..fd24153e8a48 100644 --- a/kernel/locking/qspinlock.c +++ b/kernel/locking/qspinlock.c @@ -28,6 +28,7 @@ #include <linux/percpu.h> #include <linux/hardirq.h> #include <linux/mutex.h> +#include <linux/prefetch.h> #include <asm/byteorder.h> #include <asm/qspinlock.h> diff --git a/kernel/locking/rwsem-spinlock.c b/kernel/locking/rwsem-spinlock.c index c65f7989f850..20819df98125 100644 --- a/kernel/locking/rwsem-spinlock.c +++ b/kernel/locking/rwsem-spinlock.c @@ -231,8 +231,8 @@ int __sched __down_write_common(struct rw_semaphore *sem, int state) out_nolock: list_del(&waiter.list); - if (!list_empty(&sem->wait_list)) - __rwsem_do_wake(sem, 1); + if (!list_empty(&sem->wait_list) && sem->count >= 0) + __rwsem_do_wake(sem, 0); raw_spin_unlock_irqrestore(&sem->wait_lock, flags); return -EINTR; |