drm/i915: Don't print header in error state for non-existing CS

This goes back to

commit 362b8af7ad1d91266aa4931e62be45c1e5cf753b
Author: Ben Widawsky <benjamin.widawsky@intel.com>
Date:   Thu Jan 30 00:19:38 2014 -0800

    drm/i915: Move per ring error state to ring_error

Spotted while reading error states.

Cc: Ben Widawsky <benjamin.widawsky@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

1 files changed, 7 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 89a2f3dbf956..82111b8ad374 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -242,11 +242,15 @@ static const char *hangcheck_action_to_str(enum intel_ring_hangcheck_action a)
 
 static void i915_ring_error_state(struct drm_i915_error_state_buf *m,
                                   struct drm_device *dev,
-                                  struct drm_i915_error_ring *ring)
+                                  struct drm_i915_error_state *error,
+                                  int ring_idx)
 {
+        struct drm_i915_error_ring *ring = &error->ring[ring_idx];
+
         if (!ring->valid)
                 return;
 
+        err_printf(m, "%s command stream:\n", ring_str(ring_idx));
         err_printf(m, "  HEAD: 0x%08x\n", ring->head);
         err_printf(m, "  TAIL: 0x%08x\n", ring->tail);
         err_printf(m, "  CTL: 0x%08x\n", ring->ctl);
@@ -388,10 +392,8 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
         if (INTEL_INFO(dev)->gen == 7)
                 err_printf(m, "ERR_INT: 0x%08x\n", error->err_int);
 
-        for (i = 0; i < ARRAY_SIZE(error->ring); i++) {
-                err_printf(m, "%s command stream:\n", ring_str(i));
-                i915_ring_error_state(m, dev, &error->ring[i]);
-        }
+        for (i = 0; i < ARRAY_SIZE(error->ring); i++)
+                i915_ring_error_state(m, dev, error, i);
 
         for (i = 0; i < error->vm_count; i++) {
                 err_printf(m, "vm[%d]\n", i);