linux-kernel - drivers/phy/motorola/phy-mapphone-mdm6600.c:188:16: warning: is used uninitialized in this function

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Message-ID: <201805312039.Rlh8ef3G%fengguang.wu@intel.com>
Date:   Thu, 31 May 2018 20:23:44 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Tony Lindgren <tony@...mide.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh@...nel.org>
Subject: drivers/phy/motorola/phy-mapphone-mdm6600.c:188:16: warning:  is
 used uninitialized in this function

Hi Tony,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   88a867653065dc14b0fdeeb626efb8d7ebe39be5
commit: 5d1ebbda0318b1ba55eaa1fae3fd867af17b0774 phy: mapphone-mdm6600: Add USB PHY driver for MDM6600 on Droid 4
date:   3 months ago
config: x86_64-randconfig-s5-05311957 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        git checkout 5d1ebbda0318b1ba55eaa1fae3fd867af17b0774
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   #'target_mem_ref' not supported by expression#'drivers/phy/motorola/phy-mapphone-mdm6600.c: In function 'phy_mdm6600_status':
>> drivers/phy/motorola/phy-mapphone-mdm6600.c:188:16: warning:  is used uninitialized in this function [-Wuninitialized]
      val |= values[i] << i;
             ~~~~~~^~~

vim +188 drivers/phy/motorola/phy-mapphone-mdm6600.c

   166	
   167	/**
   168	 * phy_mdm6600_status() - read mdm6600 status lines
   169	 * @ddata: device driver data
   170	 */
   171	static void phy_mdm6600_status(struct work_struct *work)
   172	{
   173		struct phy_mdm6600 *ddata;
   174		struct device *dev;
   175		int values[PHY_MDM6600_NR_STATUS_LINES];
   176		int error, i, val = 0;
   177	
   178		ddata = container_of(work, struct phy_mdm6600, status_work.work);
   179		dev = ddata->dev;
   180	
   181		error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
   182						       ddata->status_gpios->desc,
   183						       values);
   184		if (error)
   185			return;
   186	
   187		for (i = 0; i < PHY_MDM6600_NR_CMD_LINES; i++) {
 > 188			val |= values[i] << i;
   189			dev_dbg(ddata->dev, "XXX %s: i: %i values[i]: %i val: %i\n",
   190				__func__, i, values[i], val);
   191		}
   192		ddata->status = val;
   193	
   194		dev_info(dev, "modem status: %i %s\n",
   195			 ddata->status,
   196			 phy_mdm6600_status_name[ddata->status & 7]);
   197		complete(&ddata->ack);
   198	}
   199	

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