From: Will Newton <will.newton@gmail.com>
To: Yong Zhang <yong.zhang@windriver.com>
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: Threaded irq handler question
Date: Thu, 22 Apr 2010 11:51:06 +0100 [thread overview]
Message-ID: <r2l87a5b0801004220351h4ba2d1ect49c33893a30806e9@mail.gmail.com> (raw)
In-Reply-To: <20100422013721.GC8938@windriver.com>
On Thu, Apr 22, 2010 at 2:37 AM, Yong Zhang <yong.zhang@windriver.com> wrote:
> On Wed, Apr 21, 2010 at 05:35:32PM +0100, Will Newton wrote:
>> Hi all,
>> My problem is that this structure does not work, because once I call
>> disable_irq_nosync() on the irq in the check handler the thread will
>> no longer run because the irq is disabled. However if I don't call
>> disable_irq_nosync() I will get endless irqs because the line is
>> level-triggered and will not be deasserted until the thread has run.
>>
>> Could someone tell me what I'm doing wrong here?
>
> Does IRQF_ONESHOT meet your need?
Almost I think, but I believe if my check handler does not wake the
thread then I don't get another interrupt ever. I can fix this by
making my check handler always return WAKE_THREAD, which is slightly
sub-optimal, but not a big problem.
Thank you for your help!
next prev parent reply other threads:[~2010-04-22 10:51 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-21 16:35 Will Newton
2010-04-21 17:28 ` Jonathan Corbet
2010-04-22 10:51 ` Will Newton
2010-04-22 1:37 ` Yong Zhang
2010-04-22 10:51 ` Will Newton [this message]
2010-04-23 13:30 ` Mark Brown
2010-04-23 13:29 ` Mark Brown
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