From fa812ce96a46efc27cae4dcad866aaee9cb25d28 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 19 Oct 2020 09:34:44 +0100 Subject: [PATCH] drm/i915/gt: Onion unwind for scratch page allocation failure In switching to using objects for our ppGTT scratch pages, care was not taken to avoid trying to unref NULL objects on failure. And for gen6 ppGTT, it appears we forgot entirely to unwind after a partial allocation failure. Fixes: 89351925a477 ("drm/i915/gt: Switch to object allocations for page directories") Signed-off-by: Chris Wilson Cc: Matthew Auld Cc: Joonas Lahtinen Reviewed-by: Matthew Auld Link: https://patchwork.freedesktop.org/patch/msgid/20201019083444.1286-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/gt/gen6_ppgtt.c | 18 ++++++++++++------ drivers/gpu/drm/i915/gt/gen8_ppgtt.c | 3 ++- 2 files changed, 14 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/gen6_ppgtt.c b/drivers/gpu/drm/i915/gt/gen6_ppgtt.c index c0d17f8..680bd94 100644 --- a/drivers/gpu/drm/i915/gt/gen6_ppgtt.c +++ b/drivers/gpu/drm/i915/gt/gen6_ppgtt.c @@ -239,18 +239,24 @@ static int gen6_ppgtt_init_scratch(struct gen6_ppgtt *ppgtt) I915_CACHE_NONE, PTE_READ_ONLY); vm->scratch[1] = vm->alloc_pt_dma(vm, I915_GTT_PAGE_SIZE_4K); - if (IS_ERR(vm->scratch[1])) - return PTR_ERR(vm->scratch[1]); + if (IS_ERR(vm->scratch[1])) { + ret = PTR_ERR(vm->scratch[1]); + goto err_scratch0; + } ret = pin_pt_dma(vm, vm->scratch[1]); - if (ret) { - i915_gem_object_put(vm->scratch[1]); - return ret; - } + if (ret) + goto err_scratch1; fill32_px(vm->scratch[1], vm->scratch[0]->encode); return 0; + +err_scratch1: + i915_gem_object_put(vm->scratch[1]); +err_scratch0: + i915_gem_object_put(vm->scratch[0]); + return ret; } static void gen6_ppgtt_free_pd(struct gen6_ppgtt *ppgtt) diff --git a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c index b236aa0..a37c968 100644 --- a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c +++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c @@ -607,7 +607,8 @@ static int gen8_init_scratch(struct i915_address_space *vm) return 0; free_scratch: - free_scratch(vm); + while (i--) + i915_gem_object_put(vm->scratch[i]); return -ENOMEM; } -- 2.7.4