drm/i915/query: fix subslice length

We dump the info as an array of u8, so we want to know the length
in number of bytes. Current code is still safe because the
variable we use BITS_PER_TYPE on is a u8.

Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181109004013.34394-1-daniele.ceraolospurio@intel.com

diff --git a/drivers/gpu/drm/i915/i915_query.c b/drivers/gpu/drm/i915/i915_query.c
index 5821002cad42e2b32a221dabe7febdc164ad6742..6fc4b8eeab428f7b10bf56ba5c07eba5789b59a7 100644 (file)
--- a/drivers/gpu/drm/i915/i915_query.c
+++ b/drivers/gpu/drm/i915/i915_query.c
@@ -27,8 +27,7 @@ static int query_topology_info(struct drm_i915_private *dev_priv,
 
        slice_length = sizeof(sseu->slice_mask);
        subslice_length = sseu->max_slices *
-               DIV_ROUND_UP(sseu->max_subslices,
-                            BITS_PER_TYPE(sseu->subslice_mask[0]));
+               DIV_ROUND_UP(sseu->max_subslices, BITS_PER_BYTE);
        eu_length = sseu->max_slices * sseu->max_subslices *
                DIV_ROUND_UP(sseu->max_eus_per_subslice, BITS_PER_BYTE);