usb: r8a66597: add locking to r8a66597_check_detect_child
Use mutex usb_bus_idr_lock to protect idr_find.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c
index 1ef8873..bfa7fa3 100644
--- a/drivers/usb/host/r8a66597-hcd.c
+++ b/drivers/usb/host/r8a66597-hcd.c
@@ -2099,11 +2099,13 @@
memset(now_map, 0, sizeof(now_map));
+ mutex_lock(&usb_bus_idr_lock);
bus = idr_find(&usb_bus_idr, hcd->self.busnum);
if (bus && bus->root_hub) {
collect_usb_address_map(bus->root_hub, now_map);
update_usb_address_map(r8a66597, bus->root_hub, now_map);
}
+ mutex_unlock(&usb_bus_idr_lock);
}
static int r8a66597_hub_status_data(struct usb_hcd *hcd, char *buf)