Re: [TESTPATCH] xhci: fix usb2 resume timing and races.

From: kbuild test robot <lkp@intel.com>
To: Mathias Nyman <mathias.nyman@linux.intel.com>
Cc: kbuild-all@01.org, daniel@quora.org, linux-usb@vger.kernel.org,
	stern@rowland.harvard.edu, linux-kernel@vger.kernel.org,
	Mathias Nyman <mathias.nyman@linux.intel.com>
Subject: Re: [TESTPATCH] xhci: fix usb2 resume timing and races.
Date: Mon, 30 Nov 2015 23:59:38 +0800	[thread overview]
Message-ID: <201511302311.WKa4vSE1%fengguang.wu@intel.com> (raw)
In-Reply-To: <1448896592-26421-1-git-send-email-mathias.nyman@linux.intel.com>

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Hi Mathias,

[auto build test WARNING on: v4.4-rc1]
[cannot apply to: v4.4-rc3 v4.4-rc2 next-20151127]

url:    https://github.com/0day-ci/linux/commits/Mathias-Nyman/xhci-fix-usb2-resume-timing-and-races/20151130-231438
config: i386-randconfig-r0-201548 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   drivers/usb/host/xhci-hub.c: In function 'xhci_get_port_status':
>> drivers/usb/host/xhci-hub.c:812:52: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
          (raw_port_status & PORT_PLS_MASK) != XDEV_U3 &&
                                                       ^

vim +812 drivers/usb/host/xhci-hub.c

   796				bus_state->suspended_ports &= ~(1 << wIndex);
   797			} else {
   798				/*
   799				 * The resume has been signaling for less than
   800				 * 20ms. Report the port status as SUSPEND,
   801				 * let the usbcore check port status again
   802				 * and clear resume signaling later.
   803				 */
   804				status |= USB_PORT_STAT_SUSPEND;
   805			}
   806		}
   807		/* Clear stale usb2 resume signalling variables in case port changed
   808		 * state during 20ms resume signalling. For example on error
   809		 */
   810		if ((bus_state->resume_done[wIndex] ||
   811		     test_bit(wIndex, &bus_state->resuming_ports) &&
 > 812		     (raw_port_status & PORT_PLS_MASK) != XDEV_U3 &&
   813		     (raw_port_status & PORT_PLS_MASK) != XDEV_RESUME)) {
   814			bus_state->resume_done[wIndex] = 0;
   815			clear_bit(wIndex, &bus_state->resuming_ports);
   816		}
   817		if ((raw_port_status & PORT_PLS_MASK) == XDEV_U0
   818				&& (raw_port_status & PORT_POWER)
   819				&& (bus_state->suspended_ports & (1 << wIndex))) {
   820			bus_state->suspended_ports &= ~(1 << wIndex);

---
0-DAY kernel test infrastructure                Open Source Technology Center
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