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

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Message-ID: <3452498b-b89c-c72d-d196-950520ed8c50@i2se.com>
Date:   Wed, 14 Jun 2023 22:40:57 +0200
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Simon Horman <simon.horman@...igine.com>,
        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>, 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

Hi Simon,

Am 14.06.23 um 18:58 schrieb Simon Horman:
> 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")

thanks for pointing out. Unfortunately this comes from the mail server, 
which line warp here. I will try to use a different account. Sorry about 
this mess :-(

> 
>> ---
>>   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);
>>
>