On hsw/bdw VBT can signal no DP on a digital connector, so when we get a hotplug irq in that situation, don't continue if we haven't actually got a DP output register configured. This fixes an oops where the aux mutex isn't initialised. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=81856 Reported-by: lei.a.liu@xxxxxxxxx Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx> --- drivers/gpu/drm/i915/intel_dp.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index e7a7953..691d169 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -3966,6 +3966,9 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd) if (!ibx_digital_port_connected(dev_priv, intel_dig_port)) goto mst_fail; + if (!intel_dp->output_reg) + goto mst_fail; + if (!intel_dp_get_dpcd(intel_dp)) { goto mst_fail; } -- 1.9.3 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
