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Subject[PATCH 2/5] USB: Provide USB boot device availability notification
From: Alan Stern <stern@rowland.harvard.edu>

Use boot device discovery infrastructure to report availability of USB
devices.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: David VomLehn <dvomlehn@cisco.com>
---
drivers/usb/core/hub.c | 26 ++++++++++++++++++++++++++
1 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index be86ae3..01a9b76 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -37,6 +37,20 @@
#endif
#endif

+/* The mask of possible USB boot devices depends on what drivers and
+ * options have been configured into the kernel. There are too many
+ * USB network config options to list here, so just assume it is always
+ * possible to have a USB network device.
+ */
+static int usb_bootdev_mask = 0
+#ifdef CONFIG_USB_SERIAL_CONSOLE
+ | BOOTDEV_CONSOLE_MASK
+#endif
+#if defined(CONFIG_USB_STORAGE) | defined(CONFIG_BLK_DEV_UB)
+ | BOOTDEV_BLOCK_MASK
+#endif
+ | BOOTDEV_NETDEV_MASK;
+
struct usb_hub {
struct device *intfdev; /* the "interface" device */
struct usb_device *hdev;
@@ -73,6 +87,7 @@ struct usb_hub {
unsigned limited_power:1;
unsigned quiescing:1;
unsigned disconnected:1;
+ unsigned probing:1;

unsigned has_indicators:1;
u8 indicator[USB_MAXCHILDREN];
@@ -1079,6 +1094,9 @@ static int hub_configure(struct usb_hub *hub,
if (hub->has_indicators && blinkenlights)
hub->indicator [0] = INDICATOR_CYCLE;

+ hub->probing = 1;
+ bootdev_found(usb_bootdev_mask);
+
hub_activate(hub, HUB_INIT);
return 0;

@@ -1124,6 +1142,9 @@ static void hub_disconnect(struct usb_interface *intf)
usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer,
hub->buffer_dma);

+ if (hub->probing)
+ bootdev_probe_done(usb_bootdev_mask);
+
kref_put(&hub->kref, hub_release);
}

@@ -3135,6 +3156,11 @@ static void hub_events(void)
portstatus, portchange);
} /* end for i */

+ if (hub->probing) {
+ hub->probing = 0;
+ bootdev_probe_done(usb_bootdev_mask);
+ }
+
/* deal with hub status changes */
if (test_and_clear_bit(0, hub->event_bits) == 0)
; /* do nothing */

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