Re: [PATCH] Remove process freezer from suspend to RAM pathway

Matthew Garrett
2007-07-03T22:42:15Z

On Tue, Jul 03, 2007 at 06:21:42PM -0400, Alan Stern wrote:
> On Tue, 3 Jul 2007, Matthew Garrett wrote:
> > We're used to the idea of applications blocking when a resource they're
> > using goes away - NFS has done it forever.
>
> You persist in evading my point. I'm not worried about applications;
> I'm worried about drivers.
>
> Let me put it explicitly: You're writing a driver. You're working on
> the read, write, or probe method. You add code to check if a system
> sleep is underway. Suppose the answer is Yes -- what does your driver
> do next?

Leave the process blocked and defer any i/o until after resume. Why does
it need to be any more complicated than that?

--
Matthew Garrett | mjg59@srcf.ucam.org