From a7dbf00433fa9dc6f4a3828a17d56a9df2bd06b1 Mon Sep 17 00:00:00 2001
From: Ben Skeggs <bskeggs@redhat.com>
Date: Wed, 31 Oct 2012 11:19:40 +1000
Subject: [PATCH] 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>
---
drivers/gpu/drm/nouveau/core/core/mm.c | 9 ++++++---
drivers/gpu/drm/nouveau/core/include/core/mm.h | 1 -
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 4d6206448670..a6d3cd6490f7 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 9ee9bf4028ca..975137ba34a6 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);
--
2.20.1