From 4ff340f0617d02ab67a087977883ef8eff36bd68 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 18 Oct 2016 13:02:50 +0100 Subject: [PATCH] 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 Reviewed-by: Tvrtko Ursulin Link: http://patchwork.freedesktop.org/patch/msgid/20161018120251.25043-3-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_gem.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) 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 @@ i915_gem_object_put_pages(struct drm_i915_gem_object *obj) 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 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj) 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 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj) 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) -- 2.7.4