Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Mon, 14 Oct 2019 11:52:00 +0200
From:   Andrea Parri <parri.andrea@gmail.com>
To:     Michael Kelley <mikelley@microsoft.com>
Cc:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        KY Srinivasan <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        Sasha Levin <sashal@kernel.org>,
        "David S . Miller" <davem@davemloft.net>,
        vkuznets <vkuznets@redhat.com>, Dexuan Cui <decui@microsoft.com>
Subject: Re: [PATCH v2 1/3] Drivers: hv: vmbus: Introduce table of VMBus
 protocol versions
Message-ID: <20191014095200.GA11206@andrea.guest.corp.microsoft.com>
References: <20191010154600.23875-1-parri.andrea@gmail.com>
 <20191010154600.23875-2-parri.andrea@gmail.com>
 <DM5PR21MB013798776480FFA5DCD22442D7960@DM5PR21MB0137.namprd21.prod.outlook.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <DM5PR21MB013798776480FFA5DCD22442D7960@DM5PR21MB0137.namprd21.prod.outlook.com>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

> > @@ -244,20 +232,18 @@ int vmbus_connect(void)
> >  	 * version.
> >  	 */
> > 
> > -	version = VERSION_CURRENT;
> > +	for (i = 0; i < ARRAY_SIZE(vmbus_versions); i++) {
> > +		version = vmbus_versions[i];
> > 
> > -	do {
> >  		ret = vmbus_negotiate_version(msginfo, version);
> >  		if (ret == -ETIMEDOUT)
> >  			goto cleanup;
> > 
> >  		if (vmbus_connection.conn_state == CONNECTED)
> >  			break;
> > +	}
> > 
> > -		version = vmbus_get_next_version(version);
> > -	} while (version != VERSION_INVAL);
> > -
> > -	if (version == VERSION_INVAL)
> > +	if (vmbus_connection.conn_state != CONNECTED)
> >  		goto cleanup;
> > 
> 
> This is a nit, but the loop exit path bugs me.  When a connection
> is established, the loop is exited by the "break", and then
> conn_state has to be tested again to decide whether the loop
> exited due to getting a connection vs. hitting the end of the list.
> Slightly cleaner in my mind would be:
> 
> 	for (i=0; ; i++) {
> 		if (i == ARRAY_SIZE(vmbus_versions))
> 			goto cleanup;
> 
> 		version  = vmbus_versions[i];
> 		ret = vmbus_negotiate_version(msginfo, version);
> 		if (ret == -ETIMEDOUT)
> 			goto cleanup;
> 
> 		if (vmbus_connection.conn_state == CONNECTED)
> 			break;
> 	}

Indeed.  I applied this locally, for the next iteration.  Thank you for
the review, Michael.

  Andrea