Messages in this thread | | | Date | Wed, 25 Feb 2009 08:19:24 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: [linux-pm] [RFC][PATCH 2/2] PM: Rework handling of interrupts during suspend-resume |
| |
On Wed, 25 Feb 2009, Alan Stern wrote:
> On Tue, 24 Feb 2009, Rafael J. Wysocki wrote: > > > I think the most important source of level triggered interrupts are PCI > > devices, so perhaps we can make the PCI PM core use bit 10 of the PCI Device > > Control register to prevent devices from generating INTx after the drivers' > > suspend routines have been executed? > > I wish that were true. As I recall, the original PCI specification did > not define this bit, and older PCI devices don't support it. So you > can't count on being able to supress interrupt generation this way.
It's definitely a new feature. In fact, I think even the current one makes it optional, so even for "new" devices it's very unclear how many of them actually support that bit.
Linus
| |