linux-kernel - Re: [PATCH] ne.c fix for hibernate and rmmod oops fix

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Message-Id: <20080830.002215.128620618.anemo@mba.ocn.ne.jp>
Date:	Sat, 30 Aug 2008 00:22:15 +0900 (JST)
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	david@...es.net
Cc:	linux-kernel@...r.kernel.org, p_gortmaker@...oo.com
Subject: Re: [PATCH] ne.c fix for hibernate and rmmod oops fix

On Wed, 27 Aug 2008 23:11:15 -0500, David Fries <david@...es.net> wrote:
> do_ne_probe uses dev->mem_end special value 0xbad as a flag to deal
> specially when some bad, but usable devices.  The io port platform
> resource has a start and end, but if start is 0x300 and end is 0xbad,
> it will just fail with io ports in use and not probe the device.  Is
> using the flag IORESOURCE_DISABLED acceptable?  There doesn't seem to
> be any good way to pass some extra driver dependent data through to
> the platform probe function.
> 
> +	/* Bad, crippled, how about disabled?
> +	 * Any other suggestions for passing this through?
> +	 */
> +	if (dev->mem_end == BAD)
> +		r[0].flags |= IORESOURCE_DISABLED;

I'm not sure IORESOURCE_DISABLED is OK, but (ab)using r[0].name might
be safer. Something like this:

	if (dev->mem_end == BAD)
		r[0].name = "bad";

>     platform_driver support was added earlier, but without any
>     platform_device_register* calls I don't think it was being used.

Well, I added platform_driver support for some MIPS board.  I did not
touch ISA part at that time while it looks too complex for me.  Thank
you for better integration.

>     Now all devices are registered using platform_device_register_simple and
>     pointers are kept to unregister the ones that the probe failed for or
>     unregister all devices on module shutdown.  ne_init and ne_exit are no
>     longer compiled into the module to reduce confusion (and multiple
>     unregister paths that caused the rmmod oops).  With the devices
>     now registered they are added to the platform driver and get suspend
>     and resume events.  A call to pnp_stop_dev and pnp_start_dev now
>     shutsdown and initializes plug and play devices.

With your patch, cleanup_module() and ne_exit() is exactly same.  How
about unifying them?

>     mdelay(10) replaced by msleep(10) to give up the CPU.

I think this part is worth to do by separate patch.

> +	struct resource r[2] = {
> +		{
> +			.name = "io_port",
> +			.flags = IORESOURCE_IO},
> +		{
> +			.name = "irq",
> +			.flags = IORESOURCE_IRQ} };

This .name initialization seems a bit redundant for me.  They can be
left NULL.

Also I'd suggest CC-ing your patch to netdev@...r.kerne.org for more
reviews from genius people.

---
Atsushi Nemoto
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