netdev - Re: [patch 1/3] netlink: allocate group bitmaps dynamically

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Date:	Wed, 18 Jul 2007 15:34:13 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Zhang Rui <rui.zhang@...el.com>, jamal <hadi@...erus.ca>
Subject: Re: [patch 1/3] netlink: allocate group bitmaps dynamically

On Tue, 2007-07-17 at 17:45 +0200, Patrick McHardy wrote:

> > --- wireless-dev.orig/net/netlink/af_netlink.c	2007-07-17 14:05:30.210964463 +0200
> > +++ wireless-dev/net/netlink/af_netlink.c	2007-07-17 14:05:30.720964463 +0200
> > -static int netlink_alloc_groups(struct sock *sk)
> > +static int netlink_realloc_groups(struct sock *sk)
> >  {
> >  	struct netlink_sock *nlk = nlk_sk(sk);
> >  	unsigned int groups;
> > +	unsigned long *new_groups;
> >  	int err = 0;
> >  
> >  	netlink_lock_table();
> 
> 
> This is actually a bug in the current code I think, netlink_lock_table
> is a reader lock.

Looks like, changed to netlink_table_grab()


> > +int netlink_change_ngroups(int unit, unsigned int groups)
> 
> 
> I think it would be more consistent to pass the kernel socket
> instead of the unit.

Alright, changed. Also added kernel doc for the function.

> This might set the group to a value < 32. I don't expect it matters,
> but when I changed to old code to support > 32 groups I enforced
> a minimum of 32 so anything outside the kernel multicasting on them
> would still work (even though its a really stupid idea). So for
> consistency this should probably also use a minimum of 32.

Huh ok. Fixed, and added to documentation.

johannes

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