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authorChris Wilson <chris@chris-wilson.co.uk>2011-01-31 11:16:33 +0000
committerChris Wilson <chris@chris-wilson.co.uk>2011-01-31 12:36:33 +0000
commitede3ff5204b0117d00609f4980df3b864cefe96f (patch)
treedda9eb0628576ad239f1315d05e94359db1f4770 /drivers/gpu
parent9334ef755f060e251f3f395caeda1a58b6834ea3 (diff)
downloadop-kernel-dev-ede3ff5204b0117d00609f4980df3b864cefe96f.zip
op-kernel-dev-ede3ff5204b0117d00609f4980df3b864cefe96f.tar.gz
drm: Simplify and defend later checks when disabling a crtc
By setting the FB of a CRTC to NULL, we are turning off the CRTC (and so disable the unused encoders and connectors). As such we can simplify the later tests by making sure the set->mode is NULL. Setting the num_connectors to zero means that we do not need to loop over the unused connectors. All current usage appears correct, this only builds additional defense into the routine. References: https://bugzilla.kernel.org/show_bug.cgi?id=27722 Tested-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/drm_crtc_helper.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 468e8e1..c4178d7 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -497,14 +497,17 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
crtc_funcs = set->crtc->helper_private;
+ if (!set->mode)
+ set->fb = NULL;
+
if (set->fb) {
DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
set->crtc->base.id, set->fb->base.id,
(int)set->num_connectors, set->x, set->y);
} else {
- DRM_DEBUG_KMS("[CRTC:%d] [NOFB] #connectors=%d (x y) (%i %i)\n",
- set->crtc->base.id, (int)set->num_connectors,
- set->x, set->y);
+ DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
+ set->mode = NULL;
+ set->num_connectors = 0;
}
dev = set->crtc->dev;
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