Re: [PATCH] PCI: Add pci shutdown ability

[Greg KH <greg@kroah.com>]

On Mon, Apr 25, 2005 at 10:42:07PM +0200, Pavel Machek wrote:
> Hi!
> 
> > Well it seems that people are starting to want to hook the reboot
> > notifier, or the device shutdown facility in order to properly shutdown
> > pci drivers to make kexec work nicer.
> > 
> > So here's a patch for the PCI core that allows pci drivers to now just
> > add a "shutdown" notifier function that will be called when the system
> > is being shutdown.  It happens just after the reboot notifier happens,
> > and it should happen in the proper device tree order, so everyone should
> > be happy.
> > 
> > Any objections to this patch?
> 
> Yes.
> 
> I believe it should just do suspend(PMSG_SUSPEND) before system
> shutdown. If you think distintion between shutdown and suspend is
> important (I am not 100% convinced it is), we can just add flag
> saying "this is system shutdown".

Then why even have the device_shutdown() call and notifier in the struct
device_driver?

> Actually this patch should be in the queue somewhere... We had it in
> suse trees for a long time, and IMO it can solve problem easily.
> 
> 								Pavel
> 
> --- clean-git/kernel/sys.c	2005-04-23 23:21:55.000000000 +0200
> +++ linux/kernel/sys.c	2005-04-24 00:20:47.000000000 +0200
> @@ -404,6 +404,7 @@
>  	case LINUX_REBOOT_CMD_HALT:
>  		notifier_call_chain(&reboot_notifier_list, SYS_HALT, NULL);
>  		system_state = SYSTEM_HALT;
> +		device_suspend(PMSG_SUSPEND);
>  		device_shutdown();

Again, why keep device_shutdown() around at all then?

thanks,

greg k-h