From: Chris Wilson Date: Thu, 4 Aug 2016 06:52:28 +0000 (+0100) Subject: drm/i915: Kill drop_pages() X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4717ca9eec1bb88513fb5cbe62f44348d5bc946c;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git drm/i915: Kill drop_pages() The drop_pages() function is a dangerous trap in that it can release the passed in object pointer and so unless the caller is aware, it can easily trick us into using the stale object afterwards. Move it into its solitary callsite where we know it is safe. Signed-off-by: Chris Wilson Reviewed-by: Tvrtko Ursulin Link: http://patchwork.freedesktop.org/patch/msgid/1470293567-10811-9-git-send-email-chris@chris-wilson.co.uk --- diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index a38af9e58ec5..8892baaececd 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -306,20 +306,6 @@ i915_gem_object_unbind(struct drm_i915_gem_object *obj) return ret; } -static int -drop_pages(struct drm_i915_gem_object *obj) -{ - int ret; - - i915_gem_object_get(obj); - ret = i915_gem_object_unbind(obj); - if (ret == 0) - ret = i915_gem_object_put_pages(obj); - i915_gem_object_put(obj); - - return ret; -} - int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align) @@ -340,7 +326,11 @@ i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, if (obj->base.filp == NULL) return -EINVAL; - ret = drop_pages(obj); + ret = i915_gem_object_unbind(obj); + if (ret) + return ret; + + ret = i915_gem_object_put_pages(obj); if (ret) return ret;