[POWERPC] PS3: Use the HVs storage device notification mechanism properly

The PS3 hypervisor has a storage device notification mechanism to wait
until a storage device is ready.  Unfortunately the storage device
probing code used this mechanism in an incorrect way, needing a
polling loop and handling of devices that are not yet ready.

This change corrects this by:
  - First waiting for the reception of an asynchronous notification
    that a new storage device became ready,
  - Then looking up the storage device in the device repository.

On shutdown, the storage probe thread is stopped and the storage
notification device is closed using a reboot notifier.
Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/ps3/platform.h

@@ -89,8 +89,6 @@ enum ps3_dev_type {
 	PS3_DEV_TYPE_STOR_ROM = TYPE_ROM,	/* 5 */
 	PS3_DEV_TYPE_SB_GPIO = 6,
 	PS3_DEV_TYPE_STOR_FLASH = TYPE_RBC,	/* 14 */
-	PS3_DEV_TYPE_STOR_DUMMY = 32,
-	PS3_DEV_TYPE_NOACCESS = 255,
 };
 
 int ps3_repository_read_bus_str(unsigned int bus_index, const char *bus_str,

arch/powerpc/platforms/ps3/repository.c

@@ -344,35 +344,6 @@ int ps3_repository_find_device(struct ps3_repository_device *repo)
 		return result;
 	}
 
-	if (tmp.bus_type == PS3_BUS_TYPE_STORAGE) {
-		/*
-		 * A storage device may show up in the repository before the
-		 * hypervisor has finished probing its type and regions
-		 */
-		unsigned int num_regions;
-
-		if (tmp.dev_type == PS3_DEV_TYPE_STOR_DUMMY) {
-			pr_debug("%s:%u storage device not ready\n", __func__,
-				 __LINE__);
-			return -ENODEV;
-		}
-
-		result = ps3_repository_read_stor_dev_num_regions(tmp.bus_index,
-								  tmp.dev_index,
-								  &num_regions);
-		if (result) {
-			pr_debug("%s:%d read_stor_dev_num_regions failed\n",
-				 __func__, __LINE__);
-			return result;
-		}
-
-		if (!num_regions) {
-			pr_debug("%s:%u storage device has no regions yet\n",
-				 __func__, __LINE__);
-			return -ENODEV;
-		}
-	}
-
 	result = ps3_repository_read_dev_id(tmp.bus_index, tmp.dev_index,
 		&tmp.dev_id);