4 files changed, 25 insertions, 9 deletions

diff --git a/drivers/char/agp/backend.c b/drivers/char/agp/backend.c
index 73f333f491bd..4d5ed18dad00 100644
--- a/drivers/char/agp/backend.c
+++ b/drivers/char/agp/backend.c
@@ -147,6 +147,7 @@ static int agp_backend_initialize(struct agp_bridge_data *bridge)
                         printk(KERN_ERR PFX "unable to get memory for scratch page.\n");
                         return -ENOMEM;
                 }
+                global_flush_tlb();
 
                 bridge->scratch_page_real = virt_to_gart(addr);
                 bridge->scratch_page =
@@ -187,9 +188,11 @@ static int agp_backend_initialize(struct agp_bridge_data *bridge)
         return 0;
 
 err_out:
-        if (bridge->driver->needs_scratch_page)
+        if (bridge->driver->needs_scratch_page) {
                 bridge->driver->agp_destroy_page(
                                 gart_to_virt(bridge->scratch_page_real));
+                global_flush_tlb();
+        }
         if (got_gatt)
                 bridge->driver->free_gatt_table(bridge);
         if (got_keylist) {
@@ -211,9 +214,11 @@ static void agp_backend_cleanup(struct agp_bridge_data *bridge)
         bridge->key_list = NULL;
 
         if (bridge->driver->agp_destroy_page &&
-            bridge->driver->needs_scratch_page)
+            bridge->driver->needs_scratch_page) {
                 bridge->driver->agp_destroy_page(
                                 gart_to_virt(bridge->scratch_page_real));
+                global_flush_tlb();
+        }
 }
 
 /* When we remove the global variable agp_bridge from all drivers
diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
index c4a38715c6f9..19f242b50781 100644
--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -57,7 +57,8 @@ int map_page_into_agp(struct page *page)
 {
         int i;
         i = change_page_attr(page, 1, PAGE_KERNEL_NOCACHE);
-        global_flush_tlb();
+        /* Caller's responsibility to call global_flush_tlb() for
+         * performance reasons */
         return i;
 }
 EXPORT_SYMBOL_GPL(map_page_into_agp);
@@ -66,7 +67,8 @@ int unmap_page_from_agp(struct page *page)
 {
         int i;
         i = change_page_attr(page, 1, PAGE_KERNEL);
-        global_flush_tlb();
+        /* Caller's responsibility to call global_flush_tlb() for
+         * performance reasons */
         return i;
 }
 EXPORT_SYMBOL_GPL(unmap_page_from_agp);
@@ -153,6 +155,7 @@ void agp_free_memory(struct agp_memory *curr)
                 for (i = 0; i < curr->page_count; i++) {
                         curr->bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[i]));
                 }
+                global_flush_tlb();
         }
         agp_free_key(curr->key);
         vfree(curr->memory);
@@ -210,7 +213,9 @@ struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
                 new->memory[i] = virt_to_gart(addr);
                 new->page_count++;
         }
-       new->bridge = bridge;
+        global_flush_tlb();
+
+        new->bridge = bridge;
 
         flush_agp_mappings();
 
diff --git a/drivers/char/agp/i460-agp.c b/drivers/char/agp/i460-agp.c
index 58944cd271ea..be2e569ae910 100644
--- a/drivers/char/agp/i460-agp.c
+++ b/drivers/char/agp/i460-agp.c
@@ -514,9 +514,10 @@ static void *i460_alloc_page (struct agp_bridge_data *bridge)
 {
         void *page;
 
-        if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT)
+        if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT) {
                 page = agp_generic_alloc_page(agp_bridge);
-        else
+                global_flush_tlb();
+        } else
                 /* Returning NULL would cause problems */
                 /* AK: really dubious code. */
                 page = (void *)~0UL;
@@ -525,8 +526,10 @@ static void *i460_alloc_page (struct agp_bridge_data *bridge)
 
 static void i460_destroy_page (void *page)
 {
-        if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT)
+        if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT) {
                 agp_generic_destroy_page(page);
+                global_flush_tlb();
+        }
 }
 
 #endif /* I460_LARGE_IO_PAGES */
diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
index bf4cc9ffd5b1..027161ab88e9 100644
--- a/drivers/char/agp/intel-agp.c
+++ b/drivers/char/agp/intel-agp.c
@@ -270,6 +270,7 @@ static struct agp_memory *alloc_agpphysmem_i8xx(size_t pg_count, int type)
 
         switch (pg_count) {
         case 1: addr = agp_bridge->driver->agp_alloc_page(agp_bridge);
+                global_flush_tlb();
                 break;
         case 4:
                 /* kludge to get 4 physical pages for ARGB cursor */
@@ -330,9 +331,11 @@ static void intel_i810_free_by_type(struct agp_memory *curr)
         if(curr->type == AGP_PHYS_MEMORY) {
                 if (curr->page_count == 4)
                         i8xx_destroy_pages(gart_to_virt(curr->memory[0]));
-                else
+                else {
                         agp_bridge->driver->agp_destroy_page(
                                  gart_to_virt(curr->memory[0]));
+                        global_flush_tlb();
+                }
                 vfree(curr->memory);
         }
         kfree(curr);