linux-kernel - Re: [PATCH] Video : Amba: Use in_interrupt() in clcdfb

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Message-ID: <CAFLxGvygW=DeSQbRq8Wbcdy5E3e4vYcN666_9oWgnuwzT1WKqw@mail.gmail.com>
Date:	Sun, 11 Mar 2012 14:22:57 +0100
From:	richard -rw- weinberger <richard.weinberger@...il.com>
To:	santosh nayak <santoshprasadnayak@...il.com>
Cc:	linux@....linux.org.uk, FlorianSchandinat@....de,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] Video : Amba: Use in_interrupt() in clcdfb_sleep().

On Sun, Mar 11, 2012 at 2:14 PM, santosh nayak
<santoshprasadnayak@...il.com> wrote:
> From: Santosh Nayak <santoshprasadnayak@...il.com>
>
> Instead of "in_atomic()", we can use in_interrupt() to check whether
> its an interrupt context.

What is the benefit?

Your change turns clcdfb_sleep() into a ticking bomb.
If clcdfb_sleep() is called from an atomic section (e.g. under a
spinlock) it will call msleep()
and the whole thing explodes...

-- 
Thanks,
//richard
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