1 files changed, 10 insertions, 15 deletions

diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
index 8080249957af..1a8de57289eb 100644
--- a/drivers/lguest/lguest_device.c
+++ b/drivers/lguest/lguest_device.c
@@ -20,14 +20,11 @@
 /* The pointer to our (page) of device descriptions. */
 static void *lguest_devices;
 
-/* Unique numbering for lguest devices. */
-static unsigned int dev_index;
-
 /* For Guests, device memory can be used as normal memory, so we cast away the
  * __iomem to quieten sparse. */
 static inline void *lguest_map(unsigned long phys_addr, unsigned long pages)
 {
-        return (__force void *)ioremap(phys_addr, PAGE_SIZE*pages);
+        return (__force void *)ioremap_cache(phys_addr, PAGE_SIZE*pages);
 }
 
 static inline void lguest_unmap(void *addr)
@@ -325,8 +322,10 @@ static struct device lguest_root = {
  * As Andrew Tridgell says, "Untested code is buggy code".
  *
  * It's worth reading this carefully: we start with a pointer to the new device
- * descriptor in the "lguest_devices" page. */
-static void add_lguest_device(struct lguest_device_desc *d)
+ * descriptor in the "lguest_devices" page, and the offset into the device
+ * descriptor page so we can uniquely identify it if things go badly wrong. */
+static void add_lguest_device(struct lguest_device_desc *d,
+                              unsigned int offset)
 {
         struct lguest_device *ldev;
 
@@ -334,18 +333,14 @@ static void add_lguest_device(struct lguest_device_desc *d)
          * it. */
         ldev = kzalloc(sizeof(*ldev), GFP_KERNEL);
         if (!ldev) {
-                printk(KERN_EMERG "Cannot allocate lguest dev %u\n",
-                       dev_index++);
+                printk(KERN_EMERG "Cannot allocate lguest dev %u type %u\n",
+                       offset, d->type);
                 return;
         }
 
         /* This devices' parent is the lguest/ dir. */
         ldev->vdev.dev.parent = &lguest_root;
         /* We have a unique device index thanks to the dev_index counter. */
-        ldev->vdev.index = dev_index++;
-        /* The device type comes straight from the descriptor.  There's also a
-         * device vendor field in the virtio_device struct, which we leave as
-         * 0. */
         ldev->vdev.id.device = d->type;
         /* We have a simple set of routines for querying the device's
          * configuration information and setting its status. */
@@ -357,8 +352,8 @@ static void add_lguest_device(struct lguest_device_desc *d)
          * virtio_device and calls device_register().  This makes the bus
          * infrastructure look for a matching driver. */
         if (register_virtio_device(&ldev->vdev) != 0) {
-                printk(KERN_ERR "Failed to register lguest device %u\n",
-                       ldev->vdev.index);
+                printk(KERN_ERR "Failed to register lguest dev %u type %u\n",
+                       offset, d->type);
                 kfree(ldev);
         }
 }
@@ -379,7 +374,7 @@ static void scan_devices(void)
                         break;
 
                 printk("Device at %i has size %u\n", i, desc_size(d));
-                add_lguest_device(d);
+                add_lguest_device(d, i);
         }
 }