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Date: Thu, 6 Apr 2023 18:08:08 +0800
From: kernel test robot <lkp@...el.com>
To: Badhri Jagan Sridharan <badhri@...gle.com>,
gregkh@...uxfoundation.org, stern@...land.harvard.edu,
colin.i.king@...il.com, xuetao09@...wei.com,
quic_eserrao@...cinc.com, water.zhangjiantao@...wei.com,
peter.chen@...escale.com, balbi@...com
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
stable@...r.kernel.org, Badhri Jagan Sridharan <badhri@...gle.com>
Subject: Re: [PATCH v2 1/2] usb: gadget: udc: core: Invoke usb_gadget_connect
only when started
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@...el.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
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