netdev - Re: [PATCH 1/2 v2] KS8695: fix ks8695_rx

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Message-ID: <efc9214f0911160718o4c7cd0ecv2e86b8d5ad7691ae@mail.gmail.com>
Date:	Mon, 16 Nov 2009 23:18:10 +0800
From:	zeal <zealcook@...il.com>
To:	"Figo.zhang" <figo1802@...il.com>
Cc:	netdev@...r.kernel.org, ben@...tec.co.uk, davem@...emloft.net
Subject: Re: [PATCH 1/2 v2] KS8695: fix ks8695_rx_irq() bug.

On Fri, Nov 13, 2009 at 12:24 AM, Figo.zhang <figo1802@...il.com> wrote:
> On Mon, 2009-11-16 at 22:58 +0800, zeal wrote:
>> From: zeal <zealcook@...il.com>
>>
>> Sorry for the previously patches. THEY'RE NOT RIGHT. It's my mistake.
>> Please forgive my noise.
>> Please review the following patches and ignore the last (v1).
>>
>> ks8695 rx irq is edge-level. Before arriving at irq handler, the
>> corresponding status bit has been clear(irq's ack).
>> So we should not check it after that.
>
> see <KS8695X Integrated Multi-Port Gateway Solution Register
> Description> Version 1.00
>
> Interrupt Status Register(INTST Offset 0xE208)
>
> it has said: This edge-triggered interrupt status is cleared by writting
> 1 , so we should write 1 to clear status bit manually.
>
Yeah, but irq_chip's ack has done that.
Please check arch/arm/mach-ks8695/irq.c ks8695_irq_edge_chip->ack()

>>
>> Signed-off-by: zeal <zealcook@...il.com>
>> ---
>>  drivers/net/arm/ks8695net.c |   22 +++++++---------------
>>  1 files changed, 7 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/net/arm/ks8695net.c b/drivers/net/arm/ks8695net.c
>> index 0073d19..e15451a 100644
>> --- a/drivers/net/arm/ks8695net.c
>> +++ b/drivers/net/arm/ks8695net.c
>> @@ -433,24 +433,16 @@ ks8695_rx_irq(int irq, void *dev_id)
>>  {
>>       struct net_device *ndev = (struct net_device *)dev_id;
>>       struct ks8695_priv *ksp = netdev_priv(ndev);
>> -     unsigned long status;
>> -
>> -     unsigned long mask_bit = 1 << ks8695_get_rx_enable_bit(ksp);
>>
>>       spin_lock(&ksp->rx_lock);
>>
>> -     status = readl(KS8695_IRQ_VA + KS8695_INTST);
>> -
>> -     /*clean rx status bit*/
>> -     writel(status | mask_bit , KS8695_IRQ_VA + KS8695_INTST);
>> -
>> -     if (status & mask_bit) {
>> -             if (napi_schedule_prep(&ksp->napi)) {
>> -                     /*disable rx interrupt*/
>> -                     status &= ~mask_bit;
>> -                     writel(status , KS8695_IRQ_VA + KS8695_INTEN);
>> -                     __napi_schedule(&ksp->napi);
>> -             }
>> +     if (napi_schedule_prep(&ksp->napi)) {
>> +             unsigned long status = readl(KS8695_IRQ_VA + KS8695_INTEN);
>> +             unsigned long mask_bit = 1 << ks8695_get_rx_enable_bit(ksp);
>> +             /*disable rx interrupt*/
>> +             status &= ~mask_bit;
>> +             writel(status , KS8695_IRQ_VA + KS8695_INTEN);
>> +             __napi_schedule(&ksp->napi);
>>       }
>>
>>       spin_unlock(&ksp->rx_lock);
>
>
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-- 
Thanks & Regards

zeal
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