This patche gets the runtime PM reference count before calling usb_control_msg, and puts it after completion of the usb_control_msg, so that the usb control message can always be sent to one active device. Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxxxxx> --- drivers/net/usb/usbnet.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 3b51554..3f4bc69 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -1609,9 +1609,11 @@ int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, goto out; } + usb_autopm_get_interface(dev->intf); err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), cmd, reqtype, value, index, buf, size, USB_CTRL_GET_TIMEOUT); + usb_autopm_put_interface(dev->intf); if (err > 0 && err <= size) memcpy(data, buf, err); kfree(buf); @@ -1636,9 +1638,11 @@ int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, goto out; } + usb_autopm_get_interface(dev->intf); err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), cmd, reqtype, value, index, buf, size, USB_CTRL_SET_TIMEOUT); + usb_autopm_put_interface(dev->intf); kfree(buf); out: -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
