drm/udl: make usage as a console safer
authorDave Airlie <airlied@redhat.com>
Thu, 7 Feb 2013 01:19:15 +0000 (11:19 +1000)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 28 Feb 2013 14:59:03 +0000 (06:59 -0800)
commitb701cf407f9508fb899b482d9224daba2cedec75
tree2fd4bd61e5cba093b1bd76a5cf316b1a4c16234f
parent746042cf26dbcf5a8feb4f8938a3531a6169c96e
drm/udl: make usage as a console safer

commit bcb39af4486be07e896fc374a2336bad3104ae0a upstream.

Okay you don't really want to use udl devices as your console, but if
you are unlucky enough to do so, you run into a lot of schedule while atomic
due to printk being called from all sorts of funky places. So check if we
are in an atomic context, and queue the damage for later, the next printk
should cause it to appear. This isn't ideal, but it is simple, and seems to
work okay in my testing here.

(dirty area idea came from xenfb)

fixes a bunch of sleeping while atomic issues running fbcon on udl devices.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/gpu/drm/udl/udl_drv.h
drivers/gpu/drm/udl/udl_fb.c