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-rw-r--r--fs/pipe.c15
1 files changed, 6 insertions, 9 deletions
diff --git a/fs/pipe.c b/fs/pipe.c
index ea134f69a292..c16950e36ded 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -328,11 +328,13 @@ pipe_read(struct kiocb *iocb, struct iov_iter *to)
spin_lock_irq(&pipe->wait.lock);
tail++;
pipe->tail = tail;
- do_wakeup = 0;
- wake_up_interruptible_sync_poll_locked(
- &pipe->wait, EPOLLOUT | EPOLLWRNORM);
+ do_wakeup = 1;
+ if (head - (tail - 1) == pipe->max_usage)
+ wake_up_interruptible_sync_poll_locked(
+ &pipe->wait, EPOLLOUT | EPOLLWRNORM);
spin_unlock_irq(&pipe->wait.lock);
- kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
+ if (head - (tail - 1) == pipe->max_usage)
+ kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
}
total_len -= chars;
if (!total_len)
@@ -361,11 +363,6 @@ pipe_read(struct kiocb *iocb, struct iov_iter *to)
ret = -ERESTARTSYS;
break;
}
- if (do_wakeup) {
- wake_up_interruptible_sync_poll(&pipe->wait, EPOLLOUT | EPOLLWRNORM);
- kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
- do_wakeup = 0;
- }
pipe_wait(pipe);
}
__pipe_unlock(pipe);