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

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Message-ID: <CAKohpo=grLyatiDEvSi_P+atRJ=JBVs_eWKbtumEkWenPr3EDg@mail.gmail.com>
Date:	Thu, 25 Oct 2012 15:34:08 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Hongbo Zhang <hongbo.zhang@...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 15:26, Hongbo Zhang <hongbo.zhang@...aro.org> wrote:

> Verish, see the codes in include/linux/interrupt.h:

s/verish/viresh :)

> static inline int __must_check
> devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
>                  unsigned long irqflags, const char *devname, void *dev_id)
> {
>         return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
>                                          devname, dev_id);
> }
> devm_request_irq is devm_request_threaded_irq

See carefully what's happening here.

All interrupt types have a common irq_desc type in kernel. This has
few pointers for every
interrupt line:
- List of handlers to call from interrupt context
- handlers to call from process context via a thread.

So, the internal implementation is exactly same... The only difference
is which pointer
should be called in.

the devm_request_threaded_irq() called from devm_request_irq() has
following params
handler: For irq to be called from interrupt context (param 3)
NULL: For irq to be called from process context. (param 4)

So, that means  normal request_irq type only.

In your case, you have passed interrupt context pointer as NULL and
process context
one as handler. So that's an issue.

--
viresh
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