Subject: [PATCH] soc: ti: reset irq affinity before freeing irq

From: [email-masked] (Murali Karicheri)
Date: Thu, 27 Aug 2015 14:23:05 -0400

On 08/27/2015 12:43 PM, Nathan Lynch wrote:
> On 08/27/2015 10:51 AM, Murali Karicheri wrote:
>> When using accumulator queue for rx side for network driver, following
>> warning is seen when doing a reboot command from Linux console. This
>> is because, affinity value is not reset before calling free_irq(). This
>> patch fixes this.
>>
>> Deconfiguring network interfaces...
>> [   55.176589] ------------[ cut here ]-----------
>> [   55.181232] WARNING: CPU: 0 PID: 2081 at kernel/irq/manage.c:1370
>> __free_irq+0x208/0x214
>
> The full content of the warning should be included in the commit
> message; __free_irq has several potential sources of warning messages,
> and line 1370 doesn't correspond to any of them in 4.2-rc8.

The log corresponds to 4.1.x kernel. Corresponding WARN_ONCE is

#ifdef CONFIG_SMP
         /* make sure affinity_hint is cleaned up */
         if (WARN_ON_ONCE(desc->affinity_hint))
                 desc->affinity_hint = NULL;
#endif

Which is line 1922. I can edit to make it 1922. Does that work?

Murali
>
>
>> Signed-off-by: Murali Karicheri <[email-masked]>
>> ---
>>   - Applies to v4.2.0-rc8
>>
>>   drivers/soc/ti/knav_qmss_acc.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/soc/ti/knav_qmss_acc.c b/drivers/soc/ti/knav_qmss_acc.c
>> index ef6f69d..b98fe56 100644
>> --- a/drivers/soc/ti/knav_qmss_acc.c
>> +++ b/drivers/soc/ti/knav_qmss_acc.c
>> @@ -261,6 +261,10 @@ static int knav_range_setup_acc_irq(struct knav_range_info *range,
>>   	if (old && !new) {
>>   		dev_dbg(kdev->dev, "setup-acc-irq: freeing %s for channel %s\n",
>>   			acc->name, acc->name);
>> +		ret = irq_set_affinity_hint(irq, NULL);
>> +		if (ret)
>> +			dev_warn(range->kdev->dev,
>> +				 "Failed to set IRQ affinity\n");
>
> Seems unnecessary to add a warning here.
>
>

-- 
Murali Karicheri
Linux Kernel, Keystone