linux-kernel - Re: [RFC PATCH for-next 3/4] epoll: struct epoll support

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Date:	Mon, 24 Feb 2014 11:59:07 -0700
From:	Jonathan Corbet <corbet@....net>
To:	Nathaniel Yazdani <n1ght.4nd.d4y@...il.com>
Cc:	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH for-next 3/4] epoll: struct epoll support

So I was just looking things over quickly, and something jumped out at
me.  In ep_control():

> +	} else if (!(*io) && epi) {
> +		/* delete this eventpoll entry */
> +		if (is_file_epoll(target)) {
> +			tep = target->private_data;
> +			mutex_lock_nested(&tep->mtx, 1);
> +		}
> +		if (is_file_epoll(target))
> +			mutex_lock_nested(&tep->mtx, 1);

How could that possibly work?  I can't imagine tep->mtx is going to
react well to being locked a second time...

jon
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