linux-kernel - Re: [RFC] drop owner assignment from platform

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Message-ID: <20141011165650.GA1263@katana>
Date:	Sat, 11 Oct 2014 18:56:51 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Greg KH <gregkh@...uxfoundation.org>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	cocci@...teme.lip6.fr
Subject: Re: [RFC] drop owner assignment from platform_drivers


> > You got me wondering, though, that it could not be correct to call
> > platform_driver_register() from the platform core instead of module
> > init. I will check tomorrow. Still, this would be a bug independent of
> > my series. Although I'd need to respin it if platform_driver_probe()
> > needed a fix.
> 
> Right, this seems to be a preexisting bug. platform_create_bundle 
> and platform_driver_probe will both overwrite the .owner field with
> NULL since they live in builtin code. They need to be replaced with
> __platform_driver_probe and __platform_driver_register that both
> take an extra owner argument passed down from the caller in the driver
> module.

Yeah, that would be one solution. However, my personal favourite would
meanwhile be to revert the commit that Russell mentioned. I think it is
cleaner to have the owner explicitly set in the module rather than
hidden away by a function call. However, grepping through include/linux,
there are a few subsystems hiding it this way. So, it is a pattern
somewhow. Oh well...


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