Our static analysis tool noticed that 'reg' could be used uninitialized if
we are trying to get a PLL to drive VGA and SPLL is already in use
(plls->spll_refcoung != 0).
In the (error) case above, let's return false to the caller and emit an
error.
Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
---
drivers/gpu/drm/i915/intel_ddi.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index a1505e3..0eab200 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -898,6 +898,9 @@ bool intel_ddi_pll_mode_set(struct drm_crtc *crtc, int clock)
plls->spll_refcount++;
reg = SPLL_CTL;
intel_crtc->ddi_pll_sel = PORT_CLK_SEL_SPLL;
+ } else {
+ DRM_ERROR("SPLL already in use\n");
+ return false;
}
WARN(I915_READ(reg) & SPLL_PLL_ENABLE,
--
1.7.7.5
