[Intel-gfx] [PATCH 3/4] drm/915: Make sure pipe source size isn't zero

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Check that pipe_src_{w,h} aren't zero. We can currently cause a div by
zero due to the missing check, and the hardware wouldn't like it either.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index fa02677..7f61cfb 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4271,6 +4271,9 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc,
 	     intel_is_dual_link_lvds(dev)) || pipe_config->double_wide)
 		pipe_config->pipe_src_w &= ~1;
 
+	if (pipe_config->pipe_src_w == 0 || pipe_config->pipe_src_h == 0)
+		return -EINVAL;
+
 	ret = intel_check_mode(&crtc->base, adjusted_mode);
 	if (ret)
 		return ret;
-- 
1.8.1.5