netdev - Re: [PATCH 04/31] net: add support for ->poll_mask in proto

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Date:   Tue, 9 Jan 2018 17:32:37 +0100
From:   Christoph Hellwig <hch@....de>
To:     Al Viro <viro@...IV.linux.org.uk>
Cc:     Christoph Hellwig <hch@....de>, Avi Kivity <avi@...lladb.com>,
        linux-aio@...ck.org, linux-fsdevel@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/31] net: add support for ->poll_mask in proto_ops

On Sat, Jan 06, 2018 at 07:16:22PM +0000, Al Viro wrote:
> > +	__poll_t	(*poll_mask) (struct file *file, struct socket *sock,
> > +				      __poll_t events);
> 
> Does that sucker need struct file?

It turns out udp needs it:

	/* Check for false positives due to checksum errors */
	if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) &&
	    !(sk->sk_shutdown & RCV_SHUTDOWN) && first_packet_length(sk) == -1)
		mask &= ~(POLLIN | POLLRDNORM);