linux-kernel - Re: [PATCH net resend] net: qca_spi: Avoid high load if QCA7000 is not available

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Message-ID: <ZInxqMtr4Gk4Kz0V@corigine.com>
Date:   Wed, 14 Jun 2023 18:58:16 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Stefan Wahren <stefan.wahren@...rgebyte.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Stefan Wahren <stefan.wahren@...e.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net resend] net: qca_spi: Avoid high load if QCA7000 is
 not available

On Wed, Jun 14, 2023 at 01:17:14PM +0200, Stefan Wahren wrote:
> In case the QCA7000 is not available via SPI (e.g. in reset),
> the driver will cause a high load. The reason for this is
> that the synchronization is never finished and schedule()
> is never called. Since the synchronization is not timing
> critical, it's safe to drop this from the scheduling condition.
> 
> Signed-off-by: Stefan Wahren <stefan.wahren@...rgebyte.com>
> Fixes: 291ab06ecf67 ("net: qualcomm: new Ethernet over SPI driver for
>  QCA7000")

Hi Stefan,

the Fixes should be on a single line.

Fixes: 291ab06ecf67 ("net: qualcomm: new Ethernet over SPI driver for QCA7000")

> ---
>  drivers/net/ethernet/qualcomm/qca_spi.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c
>  b/drivers/net/ethernet/qualcomm/qca_spi.c

Likewise, the above two lines should be a single line.
Unfortunately it seems that because it is not git doesn't apply
this patch, which creates problems for automation linked to patchwork.

I think it would be best to repost after resolving these minor issues.

> index bba1947792ea16..90f18ea4c28ba1 100644
> --- a/drivers/net/ethernet/qualcomm/qca_spi.c
> +++ b/drivers/net/ethernet/qualcomm/qca_spi.c
> @@ -582,8 +582,7 @@ qcaspi_spi_thread(void *data)
>  	while (!kthread_should_stop()) {
>  		set_current_state(TASK_INTERRUPTIBLE);
>  		if ((qca->intr_req == qca->intr_svc) &&
> -		    (qca->txr.skb[qca->txr.head] == NULL) &&
> -		    (qca->sync == QCASPI_SYNC_READY))
> +		    !qca->txr.skb[qca->txr.head])
>  			schedule();
>  
>  		set_current_state(TASK_RUNNING);
> 

-- 
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