[PATCH 09/11] drm/i915: check connector->encoder before using it.

Dave Airlie
2014-05-21T02:55:02Z

DP MST will need connectors that aren't connected to specific
encoders, add some checks in advance to avoid oopses.

Signed-off-by: Dave Airlie <airlied@redhat.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 16 +++++++++-------
drivers/gpu/drm/i915/i915_irq.c | 4 ++++
drivers/gpu/drm/i915/intel_display.c | 25 ++++++++++++++-----------
3 files changed, 27 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 1e83ae4..88e944f 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2279,13 +2279,15 @@ static void intel_connector_info(struct seq_file *m,
seq_printf(m, "\tCEA rev: %d\n",
connector->display_info.cea_rev);
}
- if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT ||
- intel_encoder->type == INTEL_OUTPUT_EDP)
- intel_dp_info(m, intel_connector);
- else if (intel_encoder->type == INTEL_OUTPUT_HDMI)
- intel_hdmi_info(m, intel_connector);
- else if (intel_encoder->type == INTEL_OUTPUT_LVDS)
- intel_lvds_info(m, intel_connector);
+ if (intel_encoder) {
+ if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT ||
+ intel_encoder->type == INTEL_OUTPUT_EDP)
+ intel_dp_info(m, intel_connector);
+ else if (intel_encoder->type == INTEL_OUTPUT_HDMI)
+ intel_hdmi_info(m, intel_connector);
+ else if (intel_encoder->type == INTEL_OUTPUT_LVDS)
+ intel_lvds_info(m, intel_connector);
+ }

seq_printf(m, "\tmodes:\n");
list_for_each_entry(mode, &connector->modes, head)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index afa5519..5852dee 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1016,6 +1016,8 @@ static void i915_hotplug_work_func(struct work_struct *work)
dev_priv->hpd_event_bits = 0;
list_for_each_entry(connector, &mode_config->connector_list, head) {
intel_connector = to_intel_connector(connector);
+ if (!intel_connector->encoder)
+ continue;
intel_encoder = intel_connector->encoder;
if (intel_encoder->hpd_pin > HPD_NONE &&
dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_MARK_DISABLED &&
@@ -1046,6 +1048,8 @@ static void i915_hotplug_work_func(struct work_struct *work)

list_for_each_entry(connector, &mode_config->connector_list, head) {
intel_connector = to_intel_connector(connector);
+ if (!intel_connector->encoder)
+ continue;
intel_encoder = intel_connector->encoder;
if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
if (intel_encoder->hot_plug)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b39d036..75b2aaf 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4600,20 +4600,23 @@ static void intel_connector_check_state(struct intel_connector *connector)
"wrong connector dpms state\n");
WARN(connector->base.encoder != &encoder->base,
"active connector not linked to encoder\n");
- WARN(!encoder->connectors_active,
- "encoder->connectors_active not set\n");

- encoder_enabled = encoder->get_hw_state(encoder, &pipe);
- WARN(!encoder_enabled, "encoder not enabled\n");
- if (WARN_ON(!encoder->base.crtc))
- return;
+ if (encoder) {
+ WARN(!encoder->connectors_active,
+ "encoder->connectors_active not set\n");
+
+ encoder_enabled = encoder->get_hw_state(encoder, &pipe);
+ WARN(!encoder_enabled, "encoder not enabled\n");
+ if (WARN_ON(!encoder->base.crtc))
+ return;

- crtc = encoder->base.crtc;
+ crtc = encoder->base.crtc;

- WARN(!crtc->enabled, "crtc not enabled\n");
- WARN(!to_intel_crtc(crtc)->active, "crtc not active\n");
- WARN(pipe != to_intel_crtc(crtc)->pipe,
- "encoder active on the wrong pipe\n");
+ WARN(!crtc->enabled, "crtc not enabled\n");
+ WARN(!to_intel_crtc(crtc)->active, "crtc not active\n");
+ WARN(pipe != to_intel_crtc(crtc)->pipe,
+ "encoder active on the wrong pipe\n");
+ }
}
}

--
1.9.0