Now that the primary plane can be disabled independently of the CRTC,
the debugfs code needs to be updated to recognize when the primary plane
is disabled and not try to return information about the primary plane's
framebuffer.
This change prevents a NULL dereference when reading i915_display_info
with a disabled primary plane.
v2: Replace a seq_printf() with seq_puts() (suggested by Damien)
Signed-off-by: Matt Roper <matthew.d.ro...@intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
b/drivers/gpu/drm/i915/i915_debugfs.c
index a8b8140..8057fd4 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2220,9 +2220,12 @@ static void intel_crtc_info(struct seq_file *m, struct
intel_crtc *intel_crtc)
struct drm_crtc *crtc = &intel_crtc->base;
struct intel_encoder *intel_encoder;
- seq_printf(m, "\tfb: %d, pos: %dx%d, size: %dx%d\n",
- crtc->primary->fb->base.id, crtc->x, crtc->y,
- crtc->primary->fb->width, crtc->primary->fb->height);
+ if (crtc->primary->fb)
+ seq_printf(m, "\tfb: %d, pos: %dx%d, size: %dx%d\n",
+ crtc->primary->fb->base.id, crtc->x, crtc->y,
+ crtc->primary->fb->width, crtc->primary->fb->height);
+ else
+ seq_puts(m, "\tprimary plane disabled\n");
for_each_encoder_on_crtc(dev, crtc, intel_encoder)
intel_encoder_info(m, intel_crtc, intel_encoder);
}
--
1.8.5.1
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