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SubjectRe: [PATCH] USB: Don't enable LPM if it's already enabled
Hi Kai-Heng,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on usb/usb-testing]
[also build test WARNING on v4.19 next-20181029]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Kai-Heng-Feng/USB-Don-t-enable-LPM-if-it-s-already-enabled/20181030-135717
base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
config: x86_64-randconfig-x002-201843 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64

All warnings (new ones prefixed by >>):

In file included from include/linux/ioport.h:13:0,
from include/linux/device.h:15,
from drivers/usb/core/driver.c:28:
drivers/usb/core/driver.c: In function 'usb_set_usb2_hardware_lpm':
drivers/usb/core/driver.c:1904:13: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
if (enable && !udev->usb2_hw_lpm_allowed ||
~~~~~~~^~~~~~~~~~~
include/linux/compiler.h:58:30: note: in definition of macro '__trace_if'
if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
^~~~
>> drivers/usb/core/driver.c:1904:2: note: in expansion of macro 'if'
if (enable && !udev->usb2_hw_lpm_allowed ||
^~
drivers/usb/core/driver.c:1904:13: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
if (enable && !udev->usb2_hw_lpm_allowed ||
~~~~~~~^~~~~~~~~~~
include/linux/compiler.h:58:42: note: in definition of macro '__trace_if'
if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
^~~~
>> drivers/usb/core/driver.c:1904:2: note: in expansion of macro 'if'
if (enable && !udev->usb2_hw_lpm_allowed ||
^~
drivers/usb/core/driver.c:1904:13: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
if (enable && !udev->usb2_hw_lpm_allowed ||
~~~~~~~^~~~~~~~~~~
include/linux/compiler.h:69:16: note: in definition of macro '__trace_if'
______r = !!(cond); \
^~~~
>> drivers/usb/core/driver.c:1904:2: note: in expansion of macro 'if'
if (enable && !udev->usb2_hw_lpm_allowed ||
^~

vim +/if +1904 drivers/usb/core/driver.c

1898
1899 int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable)
1900 {
1901 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
1902 int ret = -EPERM;
1903
> 1904 if (enable && !udev->usb2_hw_lpm_allowed ||
1905 udev->usb2_hw_lpm_enabled == enable)
1906 return 0;
1907
1908 if (hcd->driver->set_usb2_hw_lpm) {
1909 ret = hcd->driver->set_usb2_hw_lpm(hcd, udev, enable);
1910 if (!ret)
1911 udev->usb2_hw_lpm_enabled = enable;
1912 }
1913
1914 return ret;
1915 }
1916

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