netdev - Re: [PATCH 1/2] net/fsl_pq_mdio: check TBI address for consistency with mapped range

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Message-ID: <201510100149.FPVBX63z%fengguang.wu@intel.com>
Date:	Sat, 10 Oct 2015 01:39:13 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Gerlando Falauto <gerlando.falauto@...mile.com>
Cc:	kbuild-all@...org, netdev@...r.kernel.org, timur@...i.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	ogabbay@...aoptical.com, bigeasy@...utronix.de,
	Gerlando Falauto <gerlando.falauto@...mile.com>,
	Timur Tabi <timur@...escale.com>,
	"David S. Miller" <davem@...emloft.net>,
	Andy Fleming <afleming@...escale.com>,
	Kumar Gala <galak@...nel.crashing.org>
Subject: Re: [PATCH 1/2] net/fsl_pq_mdio: check TBI address for consistency
 with mapped range

Hi Gerlando,

[auto build test WARNING on net/master -- if it's inappropriate base, please ignore]

config: powerpc-tqm8541_defconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=powerpc 

All warnings (new ones prefixed by >>):

   drivers/net/ethernet/freescale/fsl_pq_mdio.c: In function 'fsl_pq_mdio_probe':
>> drivers/net/ethernet/freescale/fsl_pq_mdio.c:454:14: warning: comparison of distinct pointer types lacks a cast
       if (tbipa > priv->map + resource_size(&res))
                 ^

vim +454 drivers/net/ethernet/freescale/fsl_pq_mdio.c

   438				if (!prop) {
   439					dev_err(&pdev->dev,
   440						"missing 'reg' property in node %s\n",
   441						tbi->full_name);
   442					err = -EBUSY;
   443					goto error;
   444				}
   445	
   446				tbipa = data->get_tbipa(priv->map);
   447	
   448				/*
   449				 * Add consistency check to make sure TBI is contained
   450				 * within the mapped range (not because we would get a
   451				 * segfault, rather to catch bugs in computing TBI
   452				 * address). Print error message but continue anyway.
   453				 */
 > 454				if (tbipa > priv->map + resource_size(&res))
   455					dev_err(&pdev->dev, "invalid register map (should be at least 0x%04x to contain TBI address)\n",
   456						((void *)tbipa - priv->map) + 4);
   457	
   458				iowrite32be(be32_to_cpup(prop), tbipa);
   459			}
   460		}
   461	
   462		if (data->ucc_configure)

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