diff options
Diffstat (limited to 'drivers/tty/tty_ldsem.c')
| -rw-r--r-- | drivers/tty/tty_ldsem.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/tty/tty_ldsem.c b/drivers/tty/tty_ldsem.c index 1bf8ed13f827..dbd7ba32caac 100644 --- a/drivers/tty/tty_ldsem.c +++ b/drivers/tty/tty_ldsem.c @@ -307,6 +307,16 @@ down_write_failed(struct ld_semaphore *sem, long count, long timeout) if (!locked) ldsem_atomic_update(-LDSEM_WAIT_BIAS, sem); list_del(&waiter.list); + + /* + * In case of timeout, wake up every reader who gave the right of way + * to writer. Prevent separation readers into two groups: + * one that helds semaphore and another that sleeps. + * (in case of no contention with a writer) + */ + if (!locked && list_empty(&sem->write_wait)) + __ldsem_wake_readers(sem); + raw_spin_unlock_irq(&sem->wait_lock); __set_task_state(tsk, TASK_RUNNING); |