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drm/nouveau/ltcg: fix allocating memory as free

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Allocating type=0 marks the memory as free. This allows the ltcg memory
to be allocated twice.

Add a BUG_ON in core/mm.c to prevent this ever happening again.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Maarten Lankhorst 2013-08-12 12:41:34 +02:00 committed by Ben Skeggs
parent 52f9a4d71b
commit 18902bbf06
2 changed files with 5 additions and 1 deletions
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4
drivers/gpu/drm/nouveau/core/core/mm.c
View file

@ -98,6 +98,8 @@ nouveau_mm_head(struct nouveau_mm *mm, u8 type, u32 size_max, u32 size_min,
u32 splitoff;
u32 s, e;
BUG_ON(!type);
list_for_each_entry(this, &mm->free, fl_entry) {
e = this->offset + this->length;
s = this->offset;
@ -162,6 +164,8 @@ nouveau_mm_tail(struct nouveau_mm *mm, u8 type, u32 size_max, u32 size_min,
struct nouveau_mm_node *prev, *this, *next;
u32 mask = align - 1;
BUG_ON(!type);
list_for_each_entry_reverse(this, &mm->free, fl_entry) {
u32 e = this->offset + this->length;
u32 s = this->offset;

2
drivers/gpu/drm/nouveau/core/subdev/ltcg/nvc0.c
View file

@ -139,7 +139,7 @@ nvc0_ltcg_init_tag_ram(struct nouveau_fb *pfb, struct nvc0_ltcg_priv *priv)
tag_size += tag_align;
tag_size = (tag_size + 0xfff) >> 12; /* round up */
ret = nouveau_mm_tail(&pfb->vram, 0, tag_size, tag_size, 1,
ret = nouveau_mm_tail(&pfb->vram, 1, tag_size, tag_size, 1,
&priv->tag_ram);
if (ret) {
priv->num_tags = 0;