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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>
This commit is contained in:
Heiner Kallweit 2016-02-03 23:36:33 +01:00 committed by Greg Kroah-Hartman
parent a4b5d606b9
commit b1249ab513
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/host/r8a66597-hcd.c
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@ -2099,11 +2099,13 @@ static void r8a66597_check_detect_child(struct r8a66597 *r8a66597,
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)