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drm/i915/gt: Onion unwind for scratch page allocation failure

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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: 89351925a4 ("drm/i915/gt: Switch to object allocations for page directories")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201019083444.1286-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-10-19 09:34:44 +01:00
parent 178536b829
commit fa812ce96a
2 changed files with 14 additions and 7 deletions
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18
drivers/gpu/drm/i915/gt/gen6_ppgtt.c
View file

@ -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)

3
drivers/gpu/drm/i915/gt/gen8_ppgtt.c
View file

@ -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;
}