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Date:   Thu, 6 Apr 2023 18:08:08 +0800
From:   kernel test robot <lkp@intel.com>
To:     Badhri Jagan Sridharan <badhri@google.com>,
        gregkh@linuxfoundation.org, stern@rowland.harvard.edu,
        colin.i.king@gmail.com, xuetao09@huawei.com,
        quic_eserrao@quicinc.com, water.zhangjiantao@huawei.com,
        peter.chen@freescale.com, balbi@ti.com
Cc:     llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
        linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
        stable@vger.kernel.org, Badhri Jagan Sridharan <badhri@google.com>
Subject: Re: [PATCH v2 1/2] usb: gadget: udc: core: Invoke usb_gadget_connect
 only when started
Message-ID: <202304061713.mqRzNBGz-lkp@intel.com>
References: <20230406062549.2461917-1-badhri@google.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20230406062549.2461917-1-badhri@google.com>
Precedence: bulk

Hi Badhri,

kernel test robot noticed the following build warnings:

[auto build test WARNING on d629c0e221cd99198b843d8351a0a9bfec6c0423]

url:    https://github.com/intel-lab-lkp/linux/commits/Badhri-Jagan-Sridharan/usb-gadget-udc-core-Prevent-redundant-calls-to-pullup/20230406-142708
base:   d629c0e221cd99198b843d8351a0a9bfec6c0423
patch link:    https://lore.kernel.org/r/20230406062549.2461917-1-badhri%40google.com
patch subject: [PATCH v2 1/2] usb: gadget: udc: core: Invoke usb_gadget_connect only when started
config: hexagon-randconfig-r041-20230403 (https://download.01.org/0day-ci/archive/20230406/202304061713.mqRzNBGz-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 67409911353323ca5edf2049ef0df54132fa1ca7)
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
        # https://github.com/intel-lab-lkp/linux/commit/2f12e8b0c9bf3d25df88c73b614c3e8d84bd7338
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Badhri-Jagan-Sridharan/usb-gadget-udc-core-Prevent-redundant-calls-to-pullup/20230406-142708
        git checkout 2f12e8b0c9bf3d25df88c73b614c3e8d84bd7338
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/usb/gadget/udc/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304061713.mqRzNBGz-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/usb/gadget/udc/core.c:17:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:334:
   include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
                                                     ^
   In file included from drivers/usb/gadget/udc/core.c:17:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:334:
   include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
                                                     ^
   In file included from drivers/usb/gadget/udc/core.c:17:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:334:
   include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
>> drivers/usb/gadget/udc/core.c:696:5: warning: no previous prototype for function 'usb_gadget_connect_locked' [-Wmissing-prototypes]
   int usb_gadget_connect_locked(struct usb_gadget *gadget)
       ^
   drivers/usb/gadget/udc/core.c:696:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int usb_gadget_connect_locked(struct usb_gadget *gadget)
   ^
   static 
>> drivers/usb/gadget/udc/core.c:749:5: warning: no previous prototype for function 'usb_gadget_disconnect_locked' [-Wmissing-prototypes]
   int usb_gadget_disconnect_locked(struct usb_gadget *gadget)
       ^
   drivers/usb/gadget/udc/core.c:749:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int usb_gadget_disconnect_locked(struct usb_gadget *gadget)
   ^
   static 
   8 warnings generated.


vim +/usb_gadget_connect_locked +696 drivers/usb/gadget/udc/core.c

   694	
   695	/* Internal version of usb_gadget_connect needs to be called with udc_connect_control_lock held. */
 > 696	int usb_gadget_connect_locked(struct usb_gadget *gadget)
   697	{
   698		int ret = 0;
   699	
   700		if (!gadget->ops->pullup) {
   701			ret = -EOPNOTSUPP;
   702			goto out;
   703		}
   704	
   705		if (gadget->deactivated || !gadget->udc->started) {
   706			/*
   707			 * If gadget is deactivated we only save new state.
   708			 * Gadget will be connected automatically after activation.
   709			 *
   710			 * udc first needs to be started before gadget can be pulled up.
   711			 */
   712			gadget->connected = true;
   713			goto out;
   714		}
   715	
   716		ret = gadget->ops->pullup(gadget, 1);
   717		if (!ret)
   718			gadget->connected = 1;
   719	
   720	out:
   721		trace_usb_gadget_connect(gadget, ret);
   722	
   723		return ret;
   724	}
   725	
   726	/**
   727	 * usb_gadget_connect - software-controlled connect to USB host
   728	 * @gadget:the peripheral being connected
   729	 *
   730	 * Enables the D+ (or potentially D-) pullup.  The host will start
   731	 * enumerating this gadget when the pullup is active and a VBUS session
   732	 * is active (the link is powered).
   733	 *
   734	 * Returns zero on success, else negative errno.
   735	 */
   736	int usb_gadget_connect(struct usb_gadget *gadget)
   737	{
   738		int ret;
   739	
   740		mutex_lock(&gadget->udc->connect_lock);
   741		ret = usb_gadget_connect_locked(gadget);
   742		mutex_unlock(&gadget->udc->connect_lock);
   743	
   744		return ret;
   745	}
   746	EXPORT_SYMBOL_GPL(usb_gadget_connect);
   747	
   748	/* Internal version of usb_gadget_disconnect needs to be called with udc->connect_lock held. */
 > 749	int usb_gadget_disconnect_locked(struct usb_gadget *gadget)
   750	{
   751		int ret = 0;
   752	
   753		if (!gadget->ops->pullup) {
   754			ret = -EOPNOTSUPP;
   755			goto out;
   756		}
   757	
   758		if (!gadget->connected)
   759			goto out;
   760	
   761		if (gadget->deactivated || !gadget->udc->started) {
   762			/*
   763			 * If gadget is deactivated we only save new state.
   764			 * Gadget will stay disconnected after activation.
   765			 *
   766			 * udc should have been started before gadget being pulled down.
   767			 */
   768			gadget->connected = false;
   769			goto out;
   770		}
   771	
   772		ret = gadget->ops->pullup(gadget, 0);
   773		if (!ret)
   774			gadget->connected = 0;
   775	
   776		mutex_lock(&udc_lock);
   777		if (gadget->udc->driver)
   778			gadget->udc->driver->disconnect(gadget);
   779		mutex_unlock(&udc_lock);
   780	
   781	out:
   782		trace_usb_gadget_disconnect(gadget, ret);
   783	
   784		return ret;
   785	}
   786	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests