linux-kernel - Re: [PATCH 4.4 234/268] enic: enable rq before updating rq descriptors

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Message-ID: <1529276779.2289.243.camel@codethink.co.uk>
Date:   Mon, 18 Jun 2018 00:06:19 +0100
From:   Ben Hutchings <ben.hutchings@...ethink.co.uk>
To:     Govindarajulu Varadarajan <gvaradar@...co.com>
Cc:     stable@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4.4 234/268] enic: enable rq before updating rq
 descriptors

On Mon, 2018-05-28 at 12:03 +0200, Greg Kroah-Hartman wrote:
> 4.4-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Govindarajulu Varadarajan <gvaradar@...co.com>
> 
> [ Upstream commit e8588e268509292550634d9a35f2723a207683b2 ]
[...]
> --- a/drivers/net/ethernet/cisco/enic/enic_main.c
> +++ b/drivers/net/ethernet/cisco/enic/enic_main.c
[...]
> @@ -1765,8 +1765,12 @@ static int enic_open(struct net_device *
> >  	return 0;
>  
>  err_out_free_rq:
> -	for (i = 0; i < enic->rq_count; i++)
> +	for (i = 0; i < enic->rq_count; i++) {
> +		err = vnic_rq_disable(&enic->rq[i]);
> +		if (err)
> +			return err;

This added code is wrong: it overwrites the error code that was
previously in err.  If vnic_rq_disable() succeeds, enic_open() will
wrongly return 0.  If vnic_rq_disable() fails, I still don't think it
makes sense to skip the remaining cleanup actins.

Ben.

>  		vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
> +	}
>  	enic_dev_notify_unset(enic);
>  err_out_free_intr:
>  	enic_unset_affinity_hint(enic);
> 
> 
> 
-- 
Ben Hutchings, Software Developer                         Codethink Ltd
https://www.codethink.co.uk/                 Dale House, 35 Dale Street
                                     Manchester, M1 2HF, United Kingdom