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>
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1 changed files with 6 additions and 3 deletions
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@ -497,14 +497,17 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
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crtc_funcs = set->crtc->helper_private;
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if (!set->mode)
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set->fb = NULL;
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if (set->fb) {
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DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
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set->crtc->base.id, set->fb->base.id,
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(int)set->num_connectors, set->x, set->y);
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} else {
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DRM_DEBUG_KMS("[CRTC:%d] [NOFB] #connectors=%d (x y) (%i %i)\n",
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set->crtc->base.id, (int)set->num_connectors,
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set->x, set->y);
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DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
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set->mode = NULL;
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set->num_connectors = 0;
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}
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dev = set->crtc->dev;
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