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authorDavid Miller <davem@davemloft.net>2009-02-15 01:08:07 -0800
committerDave Airlie <airlied@redhat.com>2009-03-13 14:24:03 +1000
commitd30333bbabb4a2cfad1f1a45c48a4e4d0065c1f6 (patch)
treeb1e79697d2aa260a5e2aaa14465632aa3326d18b /drivers/gpu/drm/ati_pcigart.c
parent6abf6bb0ff90bb77f9429bd0d90fc841c358daf3 (diff)
downloadlinux-d30333bbabb4a2cfad1f1a45c48a4e4d0065c1f6.tar.bz2
drm: ati_pcigart: Fix limit check in drm_ati_pcigart_init().
The variable 'max_pages' is ambiguous. There are two concepts of "pages" being used in this function. First, we have ATI GART pages which are always 4096 bytes. Then, we have system pages which are of size PAGE_SIZE. Eliminate the confusion by creating max_ati_pages and max_real_pages. Calculate and use them as appropriate. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Dave Airlie <airlied@linux.ie>
Diffstat (limited to 'drivers/gpu/drm/ati_pcigart.c')
-rw-r--r--drivers/gpu/drm/ati_pcigart.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/gpu/drm/ati_pcigart.c b/drivers/gpu/drm/ati_pcigart.c
index 7972ec8762c7..4d86a629a517 100644
--- a/drivers/gpu/drm/ati_pcigart.c
+++ b/drivers/gpu/drm/ati_pcigart.c
@@ -102,7 +102,7 @@ int drm_ati_pcigart_init(struct drm_device *dev, struct drm_ati_pcigart_info *ga
u32 *pci_gart, page_base, gart_idx;
dma_addr_t bus_address = 0;
int i, j, ret = 0;
- int max_pages;
+ int max_ati_pages, max_real_pages;
if (!entry) {
DRM_ERROR("no scatter/gather memory!\n");
@@ -130,14 +130,15 @@ int drm_ati_pcigart_init(struct drm_device *dev, struct drm_ati_pcigart_info *ga
pci_gart = (u32 *) address;
- max_pages = (gart_info->table_size / sizeof(u32));
- pages = (entry->pages <= max_pages)
- ? entry->pages : max_pages;
+ max_ati_pages = (gart_info->table_size / sizeof(u32));
+ max_real_pages = max_ati_pages / (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE);
+ pages = (entry->pages <= max_real_pages)
+ ? entry->pages : max_real_pages;
if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
- memset(pci_gart, 0, max_pages * sizeof(u32));
+ memset(pci_gart, 0, max_ati_pages * sizeof(u32));
} else {
- for (gart_idx = 0; gart_idx < max_pages; gart_idx++)
+ for (gart_idx = 0; gart_idx < max_ati_pages; gart_idx++)
DRM_WRITE32(map, gart_idx * sizeof(u32), 0);
}