lkml.org 
[lkml]   [2008]   [Apr]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 1/3] PM: Introduce new top level suspend and hibernation callbacks (rev. 8)
From
Date

On Sun, 2008-04-13 at 15:33 +0200, Rafael J. Wysocki wrote:
> + * The PM core executes @prepare() for all devices before starting to
> + * execute suspend callbacks for any of them, so drivers may assume all of
> + * the other devices to be present and functional while @prepare() is being
> + * executed. In particular, it is safe to make GFP_KERNEL memory
> + * allocations from within @prepare(). However, drivers may NOT assume
> + * anything about the availability of the user space at that time and it
> + * is not correct to request firmware from within @prepare() (it's too
> + * late to do that). [To work around this limitation, drivers may
> + * register suspend and hibernation notifiers that are executed before the
> + * freezing of tasks.]

Can you tell me why you kept that limitation with user space ?

I don't see the point... On the contrary, prepare() is the pefect place
to implement handshaking with userspace for drivers that need to do so,
such as the DRM.

Ben.



\
 
 \ /
  Last update: 2008-04-13 23:09    [W:0.124 / U:0.140 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site