linux-kernel - Re: dlopen-like facility for conditional loading of symbols in modules (Re: Firmware for new ti_usb_3410

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Message-ID: <45EA3447.2080504@zytor.com>
Date:	Sat, 03 Mar 2007 18:51:51 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Oleg Verych <olecom@...wer.upol.cz>
CC:	Oliver Neukum <oliver@...kum.org>,
	linux-usb-devel@...ts.sourceforge.net, Greg KH <greg@...ah.com>,
	Dale Martenson <dmartenson@...titech.com>,
	Al Borchers <alborchers@...inerpoint.com>,
	LKML <linux-kernel@...r.kernel.org>, mit-devel@...ts.printk.net
Subject: Re: dlopen-like facility for conditional loading of symbols in modules
 (Re: Firmware for new ti_usb_3410_5052 devices)

Oleg Verych wrote:
> 
> Maybe modules' dlopen() like facility would be better to handle static
> firmware or any other on-demand static data like ID tables etc.?
> 
> I.e. some additional flag for an exported symbol (in a module), that
> this symbol maybe dynamically requested and used. As far as i can see,
> depmod generates static map, unresolved symbols must be in the kernel
> (System.map).
> 

You can do this with request_module() and having your module overwrite a 
hook.

> It will solve problem of having multiple unneeded firmware images if
> driver handles many devices and firmware is allowed to be in the
> kernel. No need in additional secure infrastructure.
> 

This seems like a hacky way to accomplish what request_firmware() does 
clearer!

	-hpa
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