linux-kernel - drivers/usb/gadget/udc/s3c2410_udc.c:255:11: warning: comparison of address of 'ep->queue' equal to a null pointer is always false

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Date:   Thu, 23 Apr 2020 15:02:27 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: drivers/usb/gadget/udc/s3c2410_udc.c:255:11: warning: comparison of
 address of 'ep->queue' equal to a null pointer is always false

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   c578ddb39e565139897124e74e5a43e56538cb33
commit: afe956c577b2d5a3d9834e4424587c1ebcf90c4c kbuild: Enable -Wtautological-compare
date:   2 weeks ago
config: arm-tct_hammer_defconfig (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 2de52422acf04662b45599f77c14ce1b2cec2b81)
reproduce:
        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
        git checkout afe956c577b2d5a3d9834e4424587c1ebcf90c4c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/usb/gadget/udc/s3c2410_udc.c:255:11: warning: comparison of address of 'ep->queue' equal to a null pointer is always false [-Wtautological-pointer-compare]
           if (&ep->queue == NULL)
                ~~~~^~~~~    ~~~~
   1 warning generated.

vim +255 drivers/usb/gadget/udc/s3c2410_udc.c

3fc154b6b8134b drivers/usb/gadget/s3c2410_udc.c Arnaud Patard 2007-06-06  250  
3fc154b6b8134b drivers/usb/gadget/s3c2410_udc.c Arnaud Patard 2007-06-06  251  static void s3c2410_udc_nuke(struct s3c2410_udc *udc,
3fc154b6b8134b drivers/usb/gadget/s3c2410_udc.c Arnaud Patard 2007-06-06  252  		struct s3c2410_ep *ep, int status)
3fc154b6b8134b drivers/usb/gadget/s3c2410_udc.c Arnaud Patard 2007-06-06  253  {
3fc154b6b8134b drivers/usb/gadget/s3c2410_udc.c Arnaud Patard 2007-06-06  254  	/* Sanity check */
3fc154b6b8134b drivers/usb/gadget/s3c2410_udc.c Arnaud Patard 2007-06-06 @255  	if (&ep->queue == NULL)
3fc154b6b8134b drivers/usb/gadget/s3c2410_udc.c Arnaud Patard 2007-06-06  256  		return;
3fc154b6b8134b drivers/usb/gadget/s3c2410_udc.c Arnaud Patard 2007-06-06  257  
3fc154b6b8134b drivers/usb/gadget/s3c2410_udc.c Arnaud Patard 2007-06-06  258  	while (!list_empty(&ep->queue)) {
3fc154b6b8134b drivers/usb/gadget/s3c2410_udc.c Arnaud Patard 2007-06-06  259  		struct s3c2410_request *req;
3fc154b6b8134b drivers/usb/gadget/s3c2410_udc.c Arnaud Patard 2007-06-06  260  		req = list_entry(ep->queue.next, struct s3c2410_request,
3fc154b6b8134b drivers/usb/gadget/s3c2410_udc.c Arnaud Patard 2007-06-06  261  				queue);
3fc154b6b8134b drivers/usb/gadget/s3c2410_udc.c Arnaud Patard 2007-06-06  262  		s3c2410_udc_done(ep, req, status);
3fc154b6b8134b drivers/usb/gadget/s3c2410_udc.c Arnaud Patard 2007-06-06  263  	}
3fc154b6b8134b drivers/usb/gadget/s3c2410_udc.c Arnaud Patard 2007-06-06  264  }
3fc154b6b8134b drivers/usb/gadget/s3c2410_udc.c Arnaud Patard 2007-06-06  265  

:::::: The code at line 255 was first introduced by commit
:::::: 3fc154b6b8134b98bb94d60cad9a46ec1ffbe372 USB Gadget driver for Samsung s3c2410 ARM SoC

:::::: TO: Arnaud Patard <arnaud.patard@...-net.org>
:::::: CC: Greg Kroah-Hartman <gregkh@...e.de>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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