linux-kernel - drivers/usb/cdns3/cdnsp-gadget.c:1178:6: warning: variable 'temp

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Date:   Thu, 3 Jun 2021 03:30:00 +0800
From:   kernel test robot <lkp@...el.com>
To:     Pawel Laszczak <pawell@...ence.com>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, Peter Chen <peter.chen@....com>
Subject: drivers/usb/cdns3/cdnsp-gadget.c:1178:6: warning: variable 'temp_64'
 set but not used

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   231bc539066760aaa44d46818c85b14ca2f56d9f
commit: 3d82904559f4f5a2622db1b21de3edf2eded7664 usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver
date:   5 months ago
config: x86_64-randconfig-a005-20210601 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d41cb6bb2607fa5c7a9df2b3dab361353657d225)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3d82904559f4f5a2622db1b21de3edf2eded7664
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 3d82904559f4f5a2622db1b21de3edf2eded7664
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> drivers/usb/cdns3/cdnsp-gadget.c:1178:6: warning: variable 'temp_64' set but not used [-Wunused-but-set-variable]
           u64 temp_64;
               ^
   1 warning generated.


vim +/temp_64 +1178 drivers/usb/cdns3/cdnsp-gadget.c

  1173	
  1174	static int cdnsp_run(struct cdnsp_device *pdev,
  1175			     enum usb_device_speed speed)
  1176	{
  1177		u32 fs_speed = 0;
> 1178		u64 temp_64;
  1179		u32 temp;
  1180		int ret;
  1181	
  1182		temp_64 = cdnsp_read_64(&pdev->ir_set->erst_dequeue);
  1183		temp_64 &= ~ERST_PTR_MASK;
  1184		temp = readl(&pdev->ir_set->irq_control);
  1185		temp &= ~IMOD_INTERVAL_MASK;
  1186		temp |= ((IMOD_DEFAULT_INTERVAL / 250) & IMOD_INTERVAL_MASK);
  1187		writel(temp, &pdev->ir_set->irq_control);
  1188	
  1189		temp = readl(&pdev->port3x_regs->mode_addr);
  1190	
  1191		switch (speed) {
  1192		case USB_SPEED_SUPER_PLUS:
  1193			temp |= CFG_3XPORT_SSP_SUPPORT;
  1194			break;
  1195		case USB_SPEED_SUPER:
  1196			temp &= ~CFG_3XPORT_SSP_SUPPORT;
  1197			break;
  1198		case USB_SPEED_HIGH:
  1199			break;
  1200		case USB_SPEED_FULL:
  1201			fs_speed = PORT_REG6_FORCE_FS;
  1202			break;
  1203		default:
  1204			dev_err(pdev->dev, "invalid maximum_speed parameter %d\n",
  1205				speed);
  1206			fallthrough;
  1207		case USB_SPEED_UNKNOWN:
  1208			/* Default to superspeed. */
  1209			speed = USB_SPEED_SUPER;
  1210			break;
  1211		}
  1212	
  1213		if (speed >= USB_SPEED_SUPER) {
  1214			writel(temp, &pdev->port3x_regs->mode_addr);
  1215			cdnsp_set_link_state(pdev, &pdev->usb3_port.regs->portsc,
  1216					     XDEV_RXDETECT);
  1217		} else {
  1218			cdnsp_disable_port(pdev, &pdev->usb3_port.regs->portsc);
  1219		}
  1220	
  1221		cdnsp_set_link_state(pdev, &pdev->usb2_port.regs->portsc,
  1222				     XDEV_RXDETECT);
  1223	
  1224		cdnsp_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
  1225	
  1226		writel(PORT_REG6_L1_L0_HW_EN | fs_speed, &pdev->port20_regs->port_reg6);
  1227	
  1228		ret = cdnsp_start(pdev);
  1229		if (ret) {
  1230			ret = -ENODEV;
  1231			goto err;
  1232		}
  1233	
  1234		temp = readl(&pdev->op_regs->command);
  1235		temp |= (CMD_INTE);
  1236		writel(temp, &pdev->op_regs->command);
  1237	
  1238		temp = readl(&pdev->ir_set->irq_pending);
  1239		writel(IMAN_IE_SET(temp), &pdev->ir_set->irq_pending);
  1240	
  1241		return 0;
  1242	err:
  1243		cdnsp_halt(pdev);
  1244		return ret;
  1245	}
  1246	

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

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