linux-kernel - Re: [PATCH 4/5] xen/events: unmask a fifo event channel only if it was masked

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Message-ID: <e6dcce7e-acfb-0ca1-8ff1-e303932bc3c5@suse.com>
Date:   Thu, 22 Oct 2020 09:55:58 +0200
From:   Jan Beulich <jbeulich@...e.com>
To:     Juergen Gross <jgross@...e.com>
Cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>
Subject: Re: [PATCH 4/5] xen/events: unmask a fifo event channel only if it
 was masked

On 22.10.2020 09:42, Juergen Gross wrote:
> --- a/drivers/xen/events/events_fifo.c
> +++ b/drivers/xen/events/events_fifo.c
> @@ -236,6 +236,9 @@ static bool clear_masked_cond(volatile event_word_t *word)
>  
>  	w = *word;
>  
> +	if (!(w & (1 << EVTCHN_FIFO_MASKED)))
> +		return true;

Maybe better move this ...

>  	do {
>  		if (w & (1 << EVTCHN_FIFO_PENDING))
>  			return false;
> 

... into the loop, above this check?

Jan