Message-ID: <552CCAFA.8030107@profitbricks.com>
Date: Tue, 14 Apr 2015 10:08:26 +0200
From: Michael Wang <yun.wang@profitbricks.com>
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To: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
CC: Roland Dreier <roland@kernel.org>, Sean Hefty <sean.hefty@intel.com>,
        Hal Rosenstock <hal.rosenstock@gmail.com>, linux-rdma@vger.kernel.org,
        linux-kernel@vger.kernel.org, Tom Tucker <tom@opengridcomputing.com>,
        Steve Wise <swise@opengridcomputing.com>,
        Hoang-Nam Nguyen <hnguyen@de.ibm.com>,
        Christoph Raisch <raisch@de.ibm.com>,
        Mike Marciniszyn <infinipath@intel.com>, Eli Cohen <eli@mellanox.com>,
        Faisal Latif <faisal.latif@intel.com>,
        Jack Morgenstein <jackm@dev.mellanox.co.il>,
        Or Gerlitz <ogerlitz@mellanox.com>, Haggai Eran <haggaie@mellanox.com>,
        Ira Weiny <ira.weiny@intel.com>, Tom Talpey <tom@talpey.com>,
        Doug Ledford <dledford@redhat.com>
Subject: Re: [PATCH v3 07/28] IB/Verbs: Reform IB-ulp ipoib
References: <552BB470.4090407@profitbricks.com> <552BB5AC.6050101@profitbricks.com> <20150413192701.GA19112@obsidianresearch.com>
In-Reply-To: <20150413192701.GA19112@obsidianresearch.com>
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On 04/13/2015 09:27 PM, Jason Gunthorpe wrote:
> On Mon, Apr 13, 2015 at 02:25:16PM +0200, Michael Wang wrote:
>>  	dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
>>  	if (!dev_list)
>> @@ -1673,13 +1671,19 @@ static void ipoib_add_one(struct ib_device *device)
>>  	}
>>  
>>  	for (p = s; p <= e; ++p) {
>> -		if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
>> +		if (!rdma_tech_ib(device, p))
>>  			continue;
>>  		dev = ipoib_add_port("ib%d", device, p);
>>  		if (!IS_ERR(dev)) {
>>  			priv = netdev_priv(dev);
>>  			list_add_tail(&priv->list, dev_list);
>>  		}
>> +		count++;
>> +	}
>> +
>> +	if (!count) {
>> +		kfree(dev_list);
>> +		return;
>>  	}
> 
> This doesn't quite look right, it should be 'goto error1'
> 
> But then I read 'goto error1' and it doesn't look like it can handle
> cm_dev->port being NULL, so more fixing is needed.

Nice catch ;-) I guess the 'count++' should be inside 'if (!IS_ERR(dev))' after
link the node.

Regards,
Michael Wang

> 
> Ditto for cm_remove_one
> 
> Should audit all uses of cm_dev->port[] to make sure they can all
> handle NULL.
> 
> Jason
> 
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