linux-kernel - Why does callback irq_startup in struct irq_chip return _unsigned

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Message-ID: <a622b534-639e-a94e-8ea3-a52a49c37b6e@gmail.com>
Date:   Thu, 25 May 2017 23:28:07 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Why does callback irq_startup in struct irq_chip return _unsigned_
 int ?

Hi Thomas,

just by chance I noticed that callback irq_startup in struct irq_chip
returns an unsigned int.
This doesn't seem to make sense as the result is a normal retval which
is casted to a signed int in function irq_startup() anyway.

Is there any specific reason for this or is it simply a bug?

Rgds, Heiner