linux-kernel - Re: [PATCH V2 5/6] Thermal: Add ST-Ericsson DB8500 thermal dirver.

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Message-ID: <CAJLyvQyHuqaX1RMXV=wFcV9j1pkNTrbv7v-SjSmbweVn+BWxiQ@mail.gmail.com>
Date:	Thu, 25 Oct 2012 18:45:35 +0800
From:	Hongbo Zhang <hongbo.zhang@...aro.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Amit Kucheria <amit.kucheria@...aro.org>,
	linaro-dev@...ts.linaro.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, STEricsson_nomadik_linux@...t.st.com,
	kernel@...oocommunity.org, linaro-kernel@...ts.linaro.org,
	"hongbo.zhang" <hongbo.zhang@...aro.com>, patches@...aro.org
Subject: Re: [PATCH V2 5/6] Thermal: Add ST-Ericsson DB8500 thermal dirver.

On 25 October 2012 18:11, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> On 25 October 2012 15:34, Viresh Kumar <viresh.kumar@...aro.org> wrote:
>> On 25 October 2012 15:26, Hongbo Zhang <hongbo.zhang@...aro.org> wrote:
>
> This is what your prcmu driver's routines are doing:
>
> int db8500_prcmu_config_hotmon(u8 low, u8 high)
> {
> ...
>         wait_for_completion(&mb4_transfer.work);
> ...
>         return 0;
> }
>
> This is why others in STE have used threaded_irqs... Because the
> routine you guys call from interrupt handlers actually sleeps.
>
I should find this for you, but you find it for me :(
Thanks a lot.
> So, they can't be called from interrupt context.
>
> I wanted you to knew this :)
>
> Its okay now, you need to use threaded irq only and you can't use
> normal request_irq(). Its not that you want to make things fast that's why
> you used threaded irqs... If you try to sleep from interrupt context
> (i.e. if you
> have registered your handler with request_irq()), you will see a kernel crash.
>
> --
> viresh
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