On Tue, Feb 18, 2020 at 10:17:30AM -0800, Linus Torvalds wrote:
> @@ -722,9 +722,10 @@ pipe_release(struct inode *inode, struct file *file)
> if (file->f_mode & FMODE_WRITE)
> pipe->writers--;
>
> - if (pipe->readers || pipe->writers) {
> - wake_up_interruptible_sync_poll(&pipe->rd_wait, EPOLLIN | EPOLLRDNORM | EPOLLERR | EPOLLHUP);
> - wake_up_interruptible_sync_poll(&pipe->wr_wait, EPOLLOUT | EPOLLWRNORM | EPOLLERR | EPOLLHUP);
> + /* Was that the last reader or writer, but not the other side? */
> + if (!pipe->readers != !pipe->writers) {
> + wake_up_interruptible_all(&pipe->rd_wait);
> + wake_up_interruptible_all(&pipe->wr_wait);
> kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
> kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
> }
> @@ -1026,8 +1027,8 @@ static int wait_for_partner(struct pipe_inode_info *pipe, unsigned int *cnt)
>
> static void wake_up_partner(struct pipe_inode_info *pipe)
> {
> - wake_up_interruptible(&pipe->rd_wait);
> - wake_up_interruptible(&pipe->wr_wait);
> + wake_up_interruptible_all(&pipe->rd_wait);
> + wake_up_interruptible_all(&pipe->wr_wait);
> }
You don't want to move wake_up_partner() up and call it from pipe_release()?
