1 files changed, 23 insertions, 10 deletions

diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
index 6fa97ae6a126..af7ff56b75d0 100644
--- a/drivers/char/agp/intel-agp.c
+++ b/drivers/char/agp/intel-agp.c
@@ -126,6 +126,7 @@ static struct _intel_private {
         };
         struct page *i8xx_page;
         struct resource ifp_resource;
+        int resource_valid;
 } intel_private;
 
 static int intel_i810_fetch_size(void)
@@ -603,10 +604,14 @@ static void intel_i830_fini_flush(void)
         flush_agp_mappings();
 
         __free_page(intel_private.i8xx_page);
+        intel_private.i8xx_page = NULL;
 }
 
 static void intel_i830_setup_flush(void)
 {
+        /* return if we've already set the flush mechanism up */
+        if (intel_private.i8xx_page)
+                return;
 
         intel_private.i8xx_page = alloc_page(GFP_KERNEL | __GFP_ZERO | GFP_DMA32);
         if (!intel_private.i8xx_page) {
@@ -846,18 +851,18 @@ static void intel_i915_setup_chipset_flush(void)
         pci_read_config_dword(agp_bridge->dev, I915_IFPADDR, &temp);
         if (!(temp & 0x1)) {
                 intel_alloc_chipset_flush_resource();
-
+                intel_private.resource_valid = 1;
                 pci_write_config_dword(agp_bridge->dev, I915_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
         } else {
                 temp &= ~1;
 
+                intel_private.resource_valid = 1;
                 intel_private.ifp_resource.start = temp;
                 intel_private.ifp_resource.end = temp + PAGE_SIZE;
                 ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
-                if (ret) {
-                        intel_private.ifp_resource.start = 0;
-                        printk("Failed inserting resource into tree\n");
-                }
+                /* some BIOSes reserve this area in a pnp some don't */
+                if (ret)
+                        intel_private.resource_valid = 0;
         }
 }
 
@@ -873,6 +878,7 @@ static void intel_i965_g33_setup_chipset_flush(void)
 
                 intel_alloc_chipset_flush_resource();
 
+                intel_private.resource_valid = 1;
                 pci_write_config_dword(agp_bridge->dev, I965_IFPADDR + 4,
                         upper_32_bits(intel_private.ifp_resource.start));
                 pci_write_config_dword(agp_bridge->dev, I965_IFPADDR, (intel_private.ifp_resource.start & 0xffffffff) | 0x1);
@@ -882,20 +888,23 @@ static void intel_i965_g33_setup_chipset_flush(void)
                 temp_lo &= ~0x1;
                 l64 = ((u64)temp_hi << 32) | temp_lo;
 
+                intel_private.resource_valid = 1;
                 intel_private.ifp_resource.start = l64;
                 intel_private.ifp_resource.end = l64 + PAGE_SIZE;
                 ret = request_resource(&iomem_resource, &intel_private.ifp_resource);
-                if (!ret) {
-                        printk("Failed inserting resource into tree - continuing\n");
-                }
+                /* some BIOSes reserve this area in a pnp some don't */
+                if (ret)
+                        intel_private.resource_valid = 0;
         }
 }
 
 static void intel_i9xx_setup_flush(void)
 {
-        /* setup a resource for this object */
-        memset(&intel_private.ifp_resource, 0, sizeof(intel_private.ifp_resource));
+        /* return if already configured */
+        if (intel_private.ifp_resource.start)
+                return;
 
+        /* setup a resource for this object */
         intel_private.ifp_resource.name = "Intel Flush Page";
         intel_private.ifp_resource.flags = IORESOURCE_MEM;
 
@@ -951,6 +960,10 @@ static void intel_i915_cleanup(void)
 {
         if (intel_private.i9xx_flush_page)
                 iounmap(intel_private.i9xx_flush_page);
+        if (intel_private.resource_valid)
+                release_resource(&intel_private.ifp_resource);
+        intel_private.ifp_resource.start = 0;
+        intel_private.resource_valid = 0;
         iounmap(intel_private.gtt);
         iounmap(intel_private.registers);
 }