USB: power availability check for berry_charge

this introduces a sanity check into berry_charge to give up before
damage is done if we lack juice.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/misc/berry_charge.c b/drivers/usb/misc/berry_charge.c
index 24e2dc3148a492d6b1adaf40a484b21717ae72bd..c05a85bc5925c7ce1407ef504ec7fcfe77d57a91 100644 (file)
--- a/drivers/usb/misc/berry_charge.c
+++ b/drivers/usb/misc/berry_charge.c
@@ -123,6 +123,11 @@ static int berry_probe(struct usb_interface *intf,
 {
        struct usb_device *udev = interface_to_usbdev(intf);
 
+       if (udev->bus_mA < 500) {
+               dbg(&udev->dev, "Not enough power to charge available\n");
+               return -ENODEV;
+       }
+
        dbg(&udev->dev, "Power is set to %dmA\n",
            udev->actconfig->desc.bMaxPower * 2);