[PATCH v3 06/10] net/macb: clean up ring buffer logic

[David Laight]

> Instead of masking head and tail every time we increment them, just let them
> wrap through UINT_MAX and mask them when subscripting. Add simple accessor
> functions to do the subscripting properly to minimize the chances of messing
> this up.
...
> +static unsigned int macb_tx_ring_avail(struct macb *bp)
> +{
> +	return TX_RING_SIZE - (bp->tx_head - bp->tx_tail);
> +}

That one doesn't look quite right to me.
Surely it should be masking with 'TX_RING_SIZE - 1'

	David