From: <dayu@datangmobile.cn>
To: <leoli@freescale.com>, <galak@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org
Subject: [PATCH] fix the interrupt loss problem on powerpc IPIC (2.6.25-2.6.28)
Date: Wed, 18 Feb 2009 10:16:07 +0800 [thread overview]
Message-ID: <D728AD1FA2543948B89DE29C5BF4CD0716AC37FD@bjmail1.bj.datangmobile.com> (raw)
From: Da Yu <dayu@datangmobile.cn>
Date: Wed, 18 Feb 2009 19:58:20 +0800
Subject: [PATCH] fix the interrupt loss problem on powerpc IPIC =
(2.6.25-2.6.28)
Signed-off-by: Da Yu <dayu@datangmobile.cn>
---
--- a/arch/powerpc/sysdev/ipic.c 2009-02-18 09:47:04.000000000 +0800
+++ b/arch/powerpc/sysdev/ipic.c 2009-02-18 09:46:34.000000000 +0800
@@ -568,8 +568,7 @@ static void ipic_ack_irq(unsigned int vi
spin_lock_irqsave(&ipic_lock, flags);
- temp =3D ipic_read(ipic->regs, ipic_info[src].ack);
- temp |=3D (1 << (31 - ipic_info[src].bit));
+ temp =3D 1 << (31 - ipic_info[src].bit);
ipic_write(ipic->regs, ipic_info[src].ack, temp);
/* mb() can't guarantee that ack is finished. But it does finish
@@ -592,8 +591,7 @@ static void ipic_mask_irq_and_ack(unsign
temp &=3D ~(1 << (31 - ipic_info[src].bit));
ipic_write(ipic->regs, ipic_info[src].mask, temp);
- temp =3D ipic_read(ipic->regs, ipic_info[src].ack);
- temp |=3D (1 << (31 - ipic_info[src].bit));
+ temp =3D 1 << (31 - ipic_info[src].bit);
ipic_write(ipic->regs, ipic_info[src].ack, temp);
/* mb() can't guarantee that ack is finished. But it does finish
-----=D3=CA=BC=FE=D4=AD=BC=FE-----
=B7=A2=BC=FE=C8=CB: Li Yang [mailto:leoli@freescale.com]=20
=B7=A2=CB=CD=CA=B1=BC=E4: 2009=C4=EA2=D4=C217=C8=D5 22:38
=CA=D5=BC=FE=C8=CB: Kumar Gala
=B3=AD=CB=CD: =F3=CE=D3=ED; linux-kernel@vger.kernel.org; =
linuxppc-dev@ozlabs.org
=D6=F7=CC=E2: Re: [PATCH] fix the interrupt loss problem on powerpc IPIC =
(2.6.23)
On Tue, Feb 17, 2009 at 10:12 PM, Kumar Gala <galak@kernel.crashing.org> =
wrote:
>
> On Feb 17, 2009, at 6:44 AM, <dayu@datangmobile.cn>=20
> <dayu@datangmobile.cn>
> wrote:
>
>> From: Da Yu <dayu@datangmobile.cn>
>> Date: Tue, 17 Feb 2009 19:58:20 +0800
>> Subject: [PATCH] fix the interrupt loss problem on powerpc IPIC=20
>> (2.6.23)
>>
>> Signed-off-by: Da Yu <dayu@datangmobile.cn>
>> ---
>
> Please provide a bit more description as to why this fixes the issue.
The pending register is write 1 clear. If there are more than one =
external interrupts pending at the same time, acking the first interrupt =
will also clear other interrupt pending bits. That will cause loss of =
interrupt.
- Leo
next reply other threads:[~2009-02-18 2:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-18 2:16 dayu [this message]
2009-02-18 2:43 ` [PATCH] fix the interrupt loss problem on powerpc IPIC (2.6.25-2.6.28) Olof Johansson
-- strict thread matches above, loose matches on Subject: below --
2009-02-18 5:47 [PATCH] fix the interrupt loss problem on powerpc IPIC(2.6.25-2.6.28) dayu
2009-02-19 16:41 ` Kumar Gala
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