Re: [PATCH] PCI: Add pci shutdown ability

[Pavel Machek <pavel@ucw.cz>]

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".

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();
 		printk(KERN_EMERG "System halted.\n");
 		machine_halt();
@@ -414,6 +415,7 @@
 	case LINUX_REBOOT_CMD_POWER_OFF:
 		notifier_call_chain(&reboot_notifier_list, SYS_POWER_OFF, NULL);
 		system_state = SYSTEM_POWER_OFF;
+		device_suspend(PMSG_SUSPEND);
 		device_shutdown();
 		printk(KERN_EMERG "Power down.\n");
 		machine_power_off();
@@ -430,6 +432,7 @@
 
 		notifier_call_chain(&reboot_notifier_list, SYS_RESTART, buffer);
 		system_state = SYSTEM_RESTART;
+		device_suspend(PMSG_FREEZE);
 		device_shutdown();
 		printk(KERN_EMERG "Restarting system with command '%s'.\n", buffer);
 		machine_restart(buffer);


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