From: Eric Anholt Date: Wed, 1 Mar 2017 18:56:02 +0000 (-0800) Subject: drm/vc4: Fix OOPSes from trying to cache a partially constructed BO. X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ca39b449f6d03e8235969f12f5dd25b8eb4304d6;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git drm/vc4: Fix OOPSes from trying to cache a partially constructed BO. If a CMA allocation failed, the partially constructed BO would be unreferenced through the normal path, and we might choose to put it in the BO cache. If we then reused it before it expired from the cache, the kernel would OOPS. Signed-off-by: Eric Anholt Fixes: c826a6e10644 ("drm/vc4: Add a BO cache.") Reviewed-by: Boris Brezillon Link: http://patchwork.freedesktop.org/patch/msgid/20170301185602.6873-2-eric@anholt.net --- diff --git a/drivers/gpu/drm/vc4/vc4_bo.c b/drivers/gpu/drm/vc4/vc4_bo.c index e5c7aa935b4b..af29432a6471 100644 --- a/drivers/gpu/drm/vc4/vc4_bo.c +++ b/drivers/gpu/drm/vc4/vc4_bo.c @@ -317,6 +317,14 @@ void vc4_free_object(struct drm_gem_object *gem_bo) goto out; } + /* If this object was partially constructed but CMA allocation + * had failed, just free it. + */ + if (!bo->base.vaddr) { + vc4_bo_destroy(bo); + goto out; + } + cache_list = vc4_get_cache_list_for_size(dev, gem_bo->size); if (!cache_list) { vc4_bo_destroy(bo);