zoran drivers: absense of locking?

[Alexey Dobriyan <adobriyan@gmail.com>]

I've tried to read random part of a tree and now scratching my head
with a question:

	what protects the number and a list of registered codecs in
	zoran drivers?

Example: drivers/media/video/zr36050.c:

	/* amount of chips attached via this driver */
	static int zr36050_codecs = 0;

Decremented in zr36050_unset().
Checked for maximum value, used and incremented in zr36050_setup().

[Assigment to 0 in zr36050_init_module is not needed. dprintk() in
zr36050_cleanup_module() should be converted to BUG_ON, so I'll ignore
them.]

	zr36050_codecs
		zr36050_unset()	= struct videocodec::unset
		zr36050_setup()	= struct videocodec::setup

The only place where ->unset and ->setup methods are called is
drivers/media/video/videocodec.c:

	zr36050_codecs
		zr36050_unset()
			videocodec_detach()
		zr36050_setup()
			videocodec_attach()

Both videocodec functions are exported.

No spinlocks or semaphores in sight.

Does anybody know what protects the list of registered codecs in zoran
drivers?

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