Here is an extract from drivers/input/serio/i8042.c:
>
> static int i8042_flush(void)
> {
> unsigned long flags;
> unsigned char data, str;
> int i = 0;
>
> spin_lock_irqsave(&i8042_lock, flags);
>
> while (((str = i8042_read_status()) & I8042_STR_OBF) && (i < I8042_BUFFER_SIZE)) {
> udelay(50);
> data = i8042_read_data();
> i++;
> dbg("%02x <- i8042 (flush, %s)\n",
> data, str & I8042_STR_AUXDATA ? "aux" : "kbd");
> }
>
> spin_unlock_irqrestore(&i8042_lock, flags);
>
> return i;
> }
>
> static int i8042_controller_check(void)
> {
> if (i8042_flush() == I8042_BUFFER_SIZE) {
Doesn't it panic needlessly, while the buffer was initially full?
> pr_err("No controller found\n");
> return -ENODEV;
> }
>
> return 0;
> }
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