linux-kernel - RE: [PATCH v3 06/10] net/macb: clean up ring buffer logic

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6026B707D@saturn3.aculab.com>
Date:	Tue, 30 Oct 2012 11:12:53 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Nicolas Ferre" <nicolas.ferre@...el.com>,
	<netdev@...r.kernel.org>, <davem@...emloft.net>,
	<havard@...nnemoen.net>
Cc:	<bhutchings@...arflare.com>,
	<linux-arm-kernel@...ts.infradead.org>, <plagnioj@...osoft.com>,
	<patrice.vilchez@...el.com>, <linux-kernel@...r.kernel.org>,
	<manabian@...il.com>
Subject: RE: [PATCH v3 06/10] net/macb: clean up ring buffer logic

> 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



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