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sna: Sanity check config->compat_output 

In a headless setup this may be left initialised to -1.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-12-27 17:59:59 +00:00
parent 7725df8aa1
commit 583efd4ba0
1 changed files with 5 additions and 2 deletions
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7
src/sna/sna_display.c
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@ -1312,9 +1312,12 @@ sna_crtc_dpms(xf86CrtcPtr crtc, int mode)
void sna_mode_adjust_frame(struct sna *sna, int x, int y)
{
xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(sna->scrn);
xf86OutputPtr output = config->output[config->compat_output];
xf86CrtcPtr crtc = output->crtc;
xf86CrtcPtr crtc;
if ((unsigned)config->compat_output >= config->num_output)
return;
crtc = config->output[config->compat_output]->crtc;
if (crtc && crtc->enabled) {
int saved_x = crtc->x;
int saved_y = crtc->y;