linux-kernel - Re: [net-next] net: mvpp2: fix interrupt mask/unmask skip condition

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Date:   Thu, 11 Feb 2021 17:10:42 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     stefanc@...vell.com
Cc:     netdev@...r.kernel.org, thomas.petazzoni@...tlin.com,
        davem@...emloft.net, nadavh@...vell.com, ymarkman@...vell.com,
        linux-kernel@...r.kernel.org, kuba@...nel.org, mw@...ihalf.com,
        andrew@...n.ch, atenart@...nel.org
Subject: Re: [net-next] net: mvpp2: fix interrupt mask/unmask skip condition

On Thu, Feb 11, 2021 at 05:13:19PM +0200, stefanc@...vell.com wrote:
> From: Stefan Chulski <stefanc@...vell.com>
> 
> The condition should be skipped if CPU ID equal to nthreads.
> The patch doesn't fix any actual issue since
> nthreads = min_t(unsigned int, num_present_cpus(), MVPP2_MAX_THREADS).
> On all current Armada platforms, the number of CPU's is
> less than MVPP2_MAX_THREADS.
> 
> Fixes: e531f76757eb ("net: mvpp2: handle cases where more CPUs are available than s/w threads")
> Reported-by: Russell King <rmk+kernel@...linux.org.uk>
> Signed-off-by: Stefan Chulski <stefanc@...vell.com>

Reviewed-by: Russell King <rmk+kernel@...linux.org.uk>

Thanks.

> ---
>  drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> index a07cf60..74613d3 100644
> --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> @@ -1135,7 +1135,7 @@ static void mvpp2_interrupts_mask(void *arg)
>  	struct mvpp2_port *port = arg;
>  
>  	/* If the thread isn't used, don't do anything */
> -	if (smp_processor_id() > port->priv->nthreads)
> +	if (smp_processor_id() >= port->priv->nthreads)
>  		return;
>  
>  	mvpp2_thread_write(port->priv,
> @@ -1153,7 +1153,7 @@ static void mvpp2_interrupts_unmask(void *arg)
>  	u32 val;
>  
>  	/* If the thread isn't used, don't do anything */
> -	if (smp_processor_id() > port->priv->nthreads)
> +	if (smp_processor_id() >= port->priv->nthreads)
>  		return;
>  
>  	val = MVPP2_CAUSE_MISC_SUM_MASK |
> -- 
> 1.9.1
> 
> 

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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