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BulkWriteData *bwd = (BulkWriteData *)arg;
int retval;
int *actual_length = (int *)kmalloc(sizeof(int));
struct usb_ezusb *dev = (struct usb_ezusb *)filep->private_data;
printk(KERN_INFO "Begin to send bulk msg !\n");
retval = usb_bulk_msg(dev->udev,
usb_sndbulkpipe(dev->udev,bwd->pipeNum),
bwd->data,
bwd->dataLength,
actual_length,
0
);