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-rw-r--r--drivers/char/agp/uninorth-agp.c29
1 files changed, 22 insertions, 7 deletions
diff --git a/drivers/char/agp/uninorth-agp.c b/drivers/char/agp/uninorth-agp.c
index 703959eba45..4e05021f3f1 100644
--- a/drivers/char/agp/uninorth-agp.c
+++ b/drivers/char/agp/uninorth-agp.c
@@ -151,9 +151,6 @@ static int uninorth_insert_memory(struct agp_memory *mem, off_t pg_start,
void *temp;
int mask_type;
- temp = agp_bridge->current_size;
- num_entries = A_SIZE_32(temp)->num_entries;
-
if (type != mem->type)
return -EINVAL;
@@ -163,6 +160,12 @@ static int uninorth_insert_memory(struct agp_memory *mem, off_t pg_start,
return -EINVAL;
}
+ if (mem->page_count == 0)
+ return 0;
+
+ temp = agp_bridge->current_size;
+ num_entries = A_SIZE_32(temp)->num_entries;
+
if ((pg_start + mem->page_count) > num_entries)
return -EINVAL;
@@ -194,9 +197,6 @@ static int u3_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
u32 *gp;
int mask_type;
- temp = agp_bridge->current_size;
- num_entries = A_SIZE_32(temp)->num_entries;
-
if (type != mem->type)
return -EINVAL;
@@ -206,6 +206,12 @@ static int u3_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
return -EINVAL;
}
+ if (mem->page_count == 0)
+ return 0;
+
+ temp = agp_bridge->current_size;
+ num_entries = A_SIZE_32(temp)->num_entries;
+
if ((pg_start + mem->page_count) > num_entries)
return -EINVAL;
@@ -234,10 +240,19 @@ int u3_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
{
size_t i;
u32 *gp;
+ int mask_type;
+
+ if (type != mem->type)
+ return -EINVAL;
- if (type != 0 || mem->type != 0)
+ mask_type = agp_bridge->driver->agp_type_to_mask_type(agp_bridge, type);
+ if (mask_type != 0) {
/* We know nothing of memory types */
return -EINVAL;
+ }
+
+ if (mem->page_count == 0)
+ return 0;
gp = (u32 *) &agp_bridge->gatt_table[pg_start];
for (i = 0; i < mem->page_count; ++i)