From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jan Beulich" <JBeulich@suse.com>
Subject: Re: [PATCHv2 4/5] evtchn: remove the locking when
 unmasking an event channel
Date: Tue, 16 Jun 2015 10:19:58 +0100
Message-ID: <5580065E02000078000855B7@mail.emea.novell.com>
References: <1434383299-21833-1-git-send-email-david.vrabel@citrix.com>
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To: David Vrabel <david.vrabel@citrix.com>
Cc: xen-devel@lists.xenproject.org, Keir Fraser <keir@xen.org>, Ian Campbell <ian.campbell@citrix.com>, Tim Deegan <tim@xen.org>
List-Id: xen-devel@lists.xenproject.org

>>> On 15.06.15 at 17:48, <david.vrabel@citrix.com> wrote:
> --- a/xen/common/event_channel.c
> +++ b/xen/common/event_channel.c
> @@ -977,9 +977,7 @@ int evtchn_unmask(unsigned int port)
>      struct domain *d = current->domain;
>      struct evtchn *evtchn;
>  
> -    ASSERT(spin_is_locked(&d->event_lock));
> -
> -    if ( unlikely(!port_is_valid(d, port)) )
> +    if ( port >= read_atomic(&d->valid_evtchns) )
>          return -EINVAL;

Again this partial open coding looks wrong to me.

Jan