linux-kernel - Re: [PATCH v4] ethernet/arc/arc_emac

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Date:	Sun, 16 Jun 2013 00:41:31 -0700
From:	Joe Perches <joe@...ches.com>
To:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Francois Romieu <romieu@...zoreil.com>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	Mischa Jonker <Mischa.Jonker@...opsys.com>,
	Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	"David S. Miller" <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>
Subject: Re: [PATCH v4] ethernet/arc/arc_emac - Add new driver

On Sat, 2013-06-15 at 20:47 +0000, Alexey Brodkin wrote:
> On 06/16/2013 12:37 AM, Joe Perches wrote:
> > On Sun, 2013-06-16 at 00:20 +0400, Alexey Brodkin wrote:
[]
> >> +static int arc_emac_rx(struct net_device *ndev, int budget)
> > []
> >> +		/* Prepare the BD for next cycle */
> >> +		rx_buff->skb = netdev_alloc_skb_ip_align(ndev, buflen);
> >> +		if (unlikely(!rx_buff->skb)) {
> >> +			if (net_ratelimit())
> >> +				netdev_err(ndev, "cannot allocate skb\n");
> >
> > Unnecessary OOM message, might as well remove it.
> > rx_dropped gives the same info.
> 
> With all those error messages I wanted to make life easier (especially 
> for me) if errors appear. User will immediately know where problem 
> happened. Indeed "rx_dropped" (when it is used only once in driver) may 
> show where issue happened, but if later at some point "rx_dropped" will 
> be incremented in other locations then user won't understand immediately 
> where error happened.

Alloc errors emit a dump_stack() already so this is redundant.


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