diff options
| author | Maarten Lankhorst | 2017-06-26 10:18:35 +0200 |
|---|---|---|
| committer | Maarten Lankhorst | 2017-07-03 14:07:04 +0200 |
| commit | a874b6a3fb22c8c30f36b1f6ba5430a4c2278a6a (patch) | |
| tree | a9dfd749078333ca3aa56d5aee2f02fdeaa94b8d /drivers/gpu/drm/i915/i915_debugfs.c | |
| parent | drm/i915: Hold RPM wakelock while initializing OA buffer (diff) | |
| download | kernel-qcow2-linux-a874b6a3fb22c8c30f36b1f6ba5430a4c2278a6a.tar.gz kernel-qcow2-linux-a874b6a3fb22c8c30f36b1f6ba5430a4c2278a6a.tar.xz kernel-qcow2-linux-a874b6a3fb22c8c30f36b1f6ba5430a4c2278a6a.zip | |
drm/i915: Prevent kernel panic when reading/writing compliance debugfs files, v2.
When reading all debugfs files on a system with DP-MST the kernel panics
on a null pointer dereference because intel_dp is null for a DP-MST
connector. Detect this case and skip those connectors.
Also fix the write for the DP compliance file in the same way.
Changes since v1:
- Fix i915_displayport_test_active_write too. (DK)
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170626081835.24251-1-maarten.lankhorst@linux.intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/i915_debugfs.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_debugfs.c | 44 |
1 files changed, 32 insertions, 12 deletions
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 580bd4f4a49e..643f56b8b87c 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -3778,13 +3778,18 @@ static ssize_t i915_displayport_test_active_write(struct file *file, drm_connector_list_iter_begin(dev, &conn_iter); drm_for_each_connector_iter(connector, &conn_iter) { + struct intel_encoder *encoder; + if (connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort) continue; - if (connector->status == connector_status_connected && - connector->encoder != NULL) { - intel_dp = enc_to_intel_dp(connector->encoder); + encoder = to_intel_encoder(connector->encoder); + if (encoder && encoder->type == INTEL_OUTPUT_DP_MST) + continue; + + if (encoder && connector->status == connector_status_connected) { + intel_dp = enc_to_intel_dp(&encoder->base); status = kstrtoint(input_buffer, 10, &val); if (status < 0) break; @@ -3816,13 +3821,18 @@ static int i915_displayport_test_active_show(struct seq_file *m, void *data) drm_connector_list_iter_begin(dev, &conn_iter); drm_for_each_connector_iter(connector, &conn_iter) { + struct intel_encoder *encoder; + if (connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort) continue; - if (connector->status == connector_status_connected && - connector->encoder != NULL) { - intel_dp = enc_to_intel_dp(connector->encoder); + encoder = to_intel_encoder(connector->encoder); + if (encoder && encoder->type == INTEL_OUTPUT_DP_MST) + continue; + + if (encoder && connector->status == connector_status_connected) { + intel_dp = enc_to_intel_dp(&encoder->base); if (intel_dp->compliance.test_active) seq_puts(m, "1"); else @@ -3862,13 +3872,18 @@ static int i915_displayport_test_data_show(struct seq_file *m, void *data) drm_connector_list_iter_begin(dev, &conn_iter); drm_for_each_connector_iter(connector, &conn_iter) { + struct intel_encoder *encoder; + if (connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort) continue; - if (connector->status == connector_status_connected && - connector->encoder != NULL) { - intel_dp = enc_to_intel_dp(connector->encoder); + encoder = to_intel_encoder(connector->encoder); + if (encoder && encoder->type == INTEL_OUTPUT_DP_MST) + continue; + + if (encoder && connector->status == connector_status_connected) { + intel_dp = enc_to_intel_dp(&encoder->base); if (intel_dp->compliance.test_type == DP_TEST_LINK_EDID_READ) seq_printf(m, "%lx", @@ -3915,13 +3930,18 @@ static int i915_displayport_test_type_show(struct seq_file *m, void *data) drm_connector_list_iter_begin(dev, &conn_iter); drm_for_each_connector_iter(connector, &conn_iter) { + struct intel_encoder *encoder; + if (connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort) continue; - if (connector->status == connector_status_connected && - connector->encoder != NULL) { - intel_dp = enc_to_intel_dp(connector->encoder); + encoder = to_intel_encoder(connector->encoder); + if (encoder && encoder->type == INTEL_OUTPUT_DP_MST) + continue; + + if (encoder && connector->status == connector_status_connected) { + intel_dp = enc_to_intel_dp(&encoder->base); seq_printf(m, "%02lx", intel_dp->compliance.test_type); } else seq_puts(m, "0"); |