linux-kernel - Re: [PATCH v5 11/13] xen/pvcalls: implement poll command

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Message-ID: <aaa92ecf-b067-2e09-08de-ea3eb5821598@oracle.com>
Date:   Tue, 17 Oct 2017 18:15:32 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel@...ts.xen.org
Cc:     linux-kernel@...r.kernel.org, jgross@...e.com,
        Stefano Stabellini <stefano@...reto.com>
Subject: Re: [PATCH v5 11/13] xen/pvcalls: implement poll command


>  
> +static unsigned int pvcalls_front_poll_passive(struct file *file,
> +					       struct pvcalls_bedata *bedata,
> +					       struct sock_mapping *map,
> +					       poll_table *wait)
> +{
> +	int notify, req_id, ret;
> +	struct xen_pvcalls_request *req;
> +
> +	if (test_bit(PVCALLS_FLAG_ACCEPT_INFLIGHT,
> +		     (void *)&map->passive.flags)) {
> +		uint32_t req_id = READ_ONCE(map->passive.inflight_req_id);
> +
> +		if (req_id != PVCALLS_INVALID_ID &&
> +		    READ_ONCE(bedata->rsp[req_id].req_id) == req_id)
> +			return POLLIN | POLLRDNORM;


Same READ_ONCE() question as for an earlier patch.

-boris

> +
> +		poll_wait(file, &map->passive.inflight_accept_req, wait);
> +		return 0;
> +	}
> +