drm/i915: Don't call describe_obj on NULL pointers

Reported-by: Pavel Roskin <proski@gnu.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=38777
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 10 insertions, 6 deletions

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 4d46441cbe2d..0a893f7400fa 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1207,13 +1207,17 @@ static int i915_context_status(struct seq_file *m, void *unused)
         if (ret)
                 return ret;
 
-        seq_printf(m, "power context ");
-        describe_obj(m, dev_priv->pwrctx);
-        seq_printf(m, "\n");
+        if (dev_priv->pwrctx) {
+                seq_printf(m, "power context ");
+                describe_obj(m, dev_priv->pwrctx);
+                seq_printf(m, "\n");
+        }
 
-        seq_printf(m, "render context ");
-        describe_obj(m, dev_priv->renderctx);
-        seq_printf(m, "\n");
+        if (dev_priv->renderctx) {
+                seq_printf(m, "render context ");
+                describe_obj(m, dev_priv->renderctx);
+                seq_printf(m, "\n");
+        }
 
         mutex_unlock(&dev->mode_config.mutex);