linux-kernel - [char-misc:char-misc-linus 3/3] drivers/misc/cardreader/rtsx_usb.c:639:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true

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Date:   Fri, 1 Jul 2022 16:49:50 +0800
From:   kernel test robot <lkp@...el.com>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [char-misc:char-misc-linus 3/3]
 drivers/misc/cardreader/rtsx_usb.c:639:6: warning: variable 'ret' is used
 uninitialized whenever 'if' condition is true

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git char-misc-linus
head:   3776c78559853fd151be7c41e369fd076fb679d5
commit: 3776c78559853fd151be7c41e369fd076fb679d5 [3/3] misc: rtsx_usb: use separate command and response buffers
config: arm-buildonly-randconfig-r006-20220629 (https://download.01.org/0day-ci/archive/20220701/202207011658.rHJFVLWA-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project a9119143a2d1f4d0d0bc1fe0d819e5351b4e0deb)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git/commit/?id=3776c78559853fd151be7c41e369fd076fb679d5
        git remote add char-misc https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
        git fetch --no-tags char-misc char-misc-linus
        git checkout 3776c78559853fd151be7c41e369fd076fb679d5
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/misc/cardreader/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/misc/cardreader/rtsx_usb.c:639:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
           if (!ucr->rsp_buf)
               ^~~~~~~~~~~~~
   drivers/misc/cardreader/rtsx_usb.c:678:9: note: uninitialized use occurs here
           return ret;
                  ^~~
   drivers/misc/cardreader/rtsx_usb.c:639:2: note: remove the 'if' if its condition is always false
           if (!ucr->rsp_buf)
           ^~~~~~~~~~~~~~~~~~
   drivers/misc/cardreader/rtsx_usb.c:622:9: note: initialize the variable 'ret' to silence this warning
           int ret;
                  ^
                   = 0
   1 warning generated.


vim +639 drivers/misc/cardreader/rtsx_usb.c

   616	
   617	static int rtsx_usb_probe(struct usb_interface *intf,
   618				 const struct usb_device_id *id)
   619	{
   620		struct usb_device *usb_dev = interface_to_usbdev(intf);
   621		struct rtsx_ucr *ucr;
   622		int ret;
   623	
   624		dev_dbg(&intf->dev,
   625			": Realtek USB Card Reader found at bus %03d address %03d\n",
   626			 usb_dev->bus->busnum, usb_dev->devnum);
   627	
   628		ucr = devm_kzalloc(&intf->dev, sizeof(*ucr), GFP_KERNEL);
   629		if (!ucr)
   630			return -ENOMEM;
   631	
   632		ucr->pusb_dev = usb_dev;
   633	
   634		ucr->cmd_buf = kmalloc(IOBUF_SIZE, GFP_KERNEL);
   635		if (!ucr->cmd_buf)
   636			return -ENOMEM;
   637	
   638		ucr->rsp_buf = kmalloc(IOBUF_SIZE, GFP_KERNEL);
 > 639		if (!ucr->rsp_buf)
   640			goto out_free_cmd_buf;
   641	
   642		usb_set_intfdata(intf, ucr);
   643	
   644		ucr->vendor_id = id->idVendor;
   645		ucr->product_id = id->idProduct;
   646	
   647		mutex_init(&ucr->dev_mutex);
   648	
   649		ucr->pusb_intf = intf;
   650	
   651		/* initialize */
   652		ret = rtsx_usb_init_chip(ucr);
   653		if (ret)
   654			goto out_init_fail;
   655	
   656		/* initialize USB SG transfer timer */
   657		timer_setup(&ucr->sg_timer, rtsx_usb_sg_timed_out, 0);
   658	
   659		ret = mfd_add_hotplug_devices(&intf->dev, rtsx_usb_cells,
   660					      ARRAY_SIZE(rtsx_usb_cells));
   661		if (ret)
   662			goto out_init_fail;
   663	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp