drm/i915: Limit the scattergather coalescing to 32bits
The scattergather list uses a 32bit size counter, we should avoid
exceeding it.
v2: Also we should use unsigned int to match sg->length.
Fixes: 871dfbd67d4e ("drm/i915: Allow compaction upto SWIOTLB max segment size")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161018120251.25043-3-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 6165a3b..9bb72e5 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2205,7 +2205,7 @@
return 0;
}
-static unsigned long swiotlb_max_size(void)
+static unsigned int swiotlb_max_size(void)
{
#if IS_ENABLED(CONFIG_SWIOTLB)
return rounddown(swiotlb_nr_tbl() << IO_TLB_SHIFT, PAGE_SIZE);
@@ -2225,7 +2225,7 @@
struct sgt_iter sgt_iter;
struct page *page;
unsigned long last_pfn = 0; /* suppress gcc warning */
- unsigned long max_segment;
+ unsigned int max_segment;
int ret;
gfp_t gfp;
@@ -2238,7 +2238,7 @@
max_segment = swiotlb_max_size();
if (!max_segment)
- max_segment = obj->base.size;
+ max_segment = rounddown(UINT_MAX, PAGE_SIZE);
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (st == NULL)