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authorBen Skeggs <bskeggs@redhat.com>2012-10-31 11:19:40 +1000
committerBen Skeggs <bskeggs@redhat.com>2012-10-31 11:22:51 +1000
commita7dbf00433fa9dc6f4a3828a17d56a9df2bd06b1 (patch)
treed59a16030201ea5d9a1dded6585b36fe4cf8ffcf /drivers/gpu
parent1249ac592a2f995fef977be33abf077bdb57b3aa (diff)
drm/nouveau: allow creation of zero-sized mm
Useful for places where a given chipset may or may not have a given resource, and we want to avoid having to spray checks for the mm's existance around everywhere. Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/nouveau/core/core/mm.c9
-rw-r--r--drivers/gpu/drm/nouveau/core/include/core/mm.h1
2 files changed, 6 insertions, 4 deletions
diff --git a/drivers/gpu/drm/nouveau/core/core/mm.c b/drivers/gpu/drm/nouveau/core/core/mm.c
index 4d620644867..a6d3cd6490f 100644
--- a/drivers/gpu/drm/nouveau/core/core/mm.c
+++ b/drivers/gpu/drm/nouveau/core/core/mm.c
@@ -218,13 +218,16 @@ nouveau_mm_init(struct nouveau_mm *mm, u32 offset, u32 length, u32 block)
node = kzalloc(sizeof(*node), GFP_KERNEL);
if (!node)
return -ENOMEM;
- node->offset = roundup(offset, mm->block_size);
- node->length = rounddown(offset + length, mm->block_size) - node->offset;
+
+ if (length) {
+ node->offset = roundup(offset, mm->block_size);
+ node->length = rounddown(offset + length, mm->block_size);
+ node->length -= node->offset;
+ }
list_add_tail(&node->nl_entry, &mm->nodes);
list_add_tail(&node->fl_entry, &mm->free);
mm->heap_nodes++;
- mm->heap_size += length;
return 0;
}
diff --git a/drivers/gpu/drm/nouveau/core/include/core/mm.h b/drivers/gpu/drm/nouveau/core/include/core/mm.h
index 9ee9bf4028c..975137ba34a 100644
--- a/drivers/gpu/drm/nouveau/core/include/core/mm.h
+++ b/drivers/gpu/drm/nouveau/core/include/core/mm.h
@@ -19,7 +19,6 @@ struct nouveau_mm {
u32 block_size;
int heap_nodes;
- u32 heap_size;
};
int nouveau_mm_init(struct nouveau_mm *, u32 offset, u32 length, u32 block);