netdev - RE: [net-next 14/14] i40e: always print aqtx answer

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Message-ID: <FC41C24E35F18A40888AACA1A36F3E418ACFCC35@fmsmsx115.amr.corp.intel.com>
Date:	Thu, 24 Jul 2014 20:13:18 +0000
From:	"Nelson, Shannon" <shannon.nelson@...el.com>
To:	Joe Perches <joe@...ches.com>
CC:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"nhorman@...hat.com" <nhorman@...hat.com>,
	"sassmann@...hat.com" <sassmann@...hat.com>
Subject: RE: [net-next 14/14] i40e: always print aqtx answer

> From: Joe Perches [mailto:joe@...ches.com]
> Sent: Thursday, July 24, 2014 12:56 PM
> 
> On Thu, 2014-07-24 at 19:20 +0000, Nelson, Shannon wrote:
> > > From: Joe Perches [mailto:joe@...ches.com]
> > > Sent: Thursday, July 24, 2014 11:43 AM
> > >
> > > On Thu, 2014-07-24 at 06:13 -0700, Jeff Kirsher wrote:
> > > > From: Shannon Nelson <shannon.nelson@...el.com>
> > > >
> > > > Sometimes the AQTX answer comes back with no data, but we still
> want
> > > to print
> > > > the descriptor that got written back.
> > >
> > > Maybe this does some reads from buffer beyond its size
> > > in i40e_debug_aq?  Is that always safe?
> >
> > This is safe because we'll only print the descriptor in this case,
> not the buffer.  There's a check in i40e_debug_aq() for NULL or zero-
> length buffer.
> 
> The question is not for descriptor length 0 or null,
> but bad descriptor length.
> 

We defined and allocated the descriptors in the AQ descriptor struct ring and we know they won't change size.  Or am I missing something?

sln

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