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 24e2dc3..c05a85b 100644
--- a/drivers/usb/misc/berry_charge.c
+++ b/drivers/usb/misc/berry_charge.c
@@ -123,6 +123,11 @@
{
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);