linux-kernel - Re: [PATCH] net: wan: wanxl.c: Cleaning up declaration of a while loop

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Message-ID: <m3egz0mxgd.fsf@intrepid.localdomain>
Date:	Sat, 07 Jun 2014 19:38:42 +0200
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: wan: wanxl.c:  Cleaning up declaration of a while loop

Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se> writes:

> Unusual declaration of a while loop.
> However, believe you also want to make sure that the pointer is not NULL

Not really. The code is meant to do exactly what it currently does -
set variable desc and then check desc->stat.
All rx_descs are at this point already initialized and not NULL
(if desc was indeed NULL we better BUG*() or Oops on desc->stat access
instead of failing silently).

> --- a/drivers/net/wan/wanxl.c
> +++ b/drivers/net/wan/wanxl.c
> @@ -196,7 +196,7 @@ static inline void wanxl_tx_intr(port_t *port)
>  static inline void wanxl_rx_intr(card_t *card)
>  {
>  	desc_t *desc;
> -	while (desc = &card->status->rx_descs[card->rx_in],
> +	while (desc = &card->status->rx_descs[card->rx_in] &&
>  	       desc->stat != PACKET_EMPTY) {
>  		if ((desc->stat & PACKET_PORT_MASK) > card->n_ports)
>  			pr_crit("%s: received packet for nonexistent port\n",

-- 
Krzysztof Halasa
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