netdev - Re: [PATCH] cnic: fix double initalization of bnx2 based cards

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Date:	Tue, 8 Mar 2011 11:07:57 -0800
From:	"Michael Chan" <mchan@...adcom.com>
To:	"Ben Hutchings" <bhutchings@...arflare.com>
cc:	"Neil Horman" <nhorman@...driver.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"Dmitry Kravkov" <dmitry@...adcom.com>,
	"Eddie Wai" <eddie.wai@...adcom.com>,
	"Eilon Greenstein" <eilong@...adcom.com>
Subject: Re: [PATCH] cnic: fix double initalization of bnx2 based cards


On Tue, 2011-03-08 at 10:59 -0800, Ben Hutchings wrote:
> On Tue, 2011-03-08 at 13:56 -0500, Neil Horman wrote:
> > bnx2 cards can work with the cnic driver, but when the cnic driver detects a
> > bnx2 card, is_cnic_dev erroneously calls the initalization routines for both
> > bnx2 and bnx2x (the former being a regex subset of the later).
> 
> Since when does strcmp() do a regex match?

Yeah, strcmp() does NULL-terminated string compare, right?

> 
> And why is a function named 'is_cnic_dev' doing initialisation, anyway?

Just data structure init if a supported device is detected.

> 
> Ben.
> 
> >   This causes
> > initalization of bnx2 to unilaterally fail in the cnic driver, which, while not
> > catastrophic, is definately not expected.  Fix this by choosing either the bnx2
> > or bnx2x initalization path, not both
> > 
> > Signed-off-by: Neil Horman <nhorman@...driver.com>
> > CC: David S. Miller <davem@...emloft.net>
> > CC: Michael Chan <mchan@...adcom.com>
> > CC: Dmitry Kravkov <dmitry@...adcom.com>
> > CC: Eddie Wai <waie@...adcom.com>
> > CC: Eilon Greenstein <eilong@...adcom.com>
> > ---
> >  drivers/net/cnic.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/drivers/net/cnic.c b/drivers/net/cnic.c
> > index 271a1f0..18b59ad 100644
> > --- a/drivers/net/cnic.c
> > +++ b/drivers/net/cnic.c
> > @@ -5292,7 +5292,7 @@ static struct cnic_dev *is_cnic_dev(struct net_device *dev)
> >  
> >  		if (!strcmp(drvinfo.driver, "bnx2"))
> >  			cdev = init_bnx2_cnic(dev);
> > -		if (!strcmp(drvinfo.driver, "bnx2x"))
> > +		else if (!strcmp(drvinfo.driver, "bnx2x"))
> >  			cdev = init_bnx2x_cnic(dev);
> >  		if (cdev) {
> >  			write_lock(&cnic_dev_lock);
> 


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