netdev - RE: [Pv-drivers] [PATCH net-next] vmxnet3: set netdev parant device before calling netdev

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Date:	Wed, 20 Jul 2011 20:49:01 -0700
From:	Joe Perches <joe@...ches.com>
To:	Scott Goldman <scottjg@...are.com>
Cc:	Shreyas Bhatewara <sbhatewara@...are.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"pv-drivers@...are.com" <pv-drivers@...are.com>
Subject: RE: [Pv-drivers] [PATCH net-next] vmxnet3: set netdev parant
 device before calling netdev_info

On Wed, 2011-07-20 at 20:06 -0700, Scott Goldman wrote:
> > Parent device for netdev should be set before netdev_info() can be called
> > otherwise there is a NULL pointer dereference and probe() fails.

I believe this is not true.
I don't see any NULL pointer dereference here.
functions and macros reordered top to bottom.

define_netdev_printk_level(netdev_info, KERN_INFO);

#define define_netdev_printk_level(func, level)			\
int func(const struct net_device *dev, const char *fmt, ...)	\
{								\
	int r;							\
	struct va_format vaf;					\
	va_list args;						\
								\
	va_start(args, fmt);					\
								\
	vaf.fmt = fmt;						\
	vaf.va = &args;						\
								\
	r = __netdev_printk(level, dev, &vaf);			\
	va_end(args);						\
								\
	return r;						\
}								\
EXPORT_SYMBOL(func);

static int __netdev_printk(const char *level, const struct net_device *dev,
			   struct va_format *vaf)
{
	int r;

	if (dev && dev->dev.parent)
		r = dev_printk(level, dev->dev.parent, "%s: %pV",
			       netdev_name(dev), vaf);
	else if (dev)
		r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
	else
		r = printk("%s(NULL net_device): %pV", level, vaf);

	return r;
}

static inline const char *netdev_name(const struct net_device *dev)
{
	if (dev->reg_state != NETREG_REGISTERED)
		return "(unregistered net_device)";
	return dev->name;
}


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