Hi all,

[This is deliberately long ...]

While building Linus' tree, today's linux-next build (x86_64
allmodconfig) produced these warnings:

drivers/i2c/muxes/gpio-i2cmux.c: In function 'gpiomux_probe':
drivers/i2c/muxes/gpio-i2cmux.c:101: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/leds/leds-bd2802.c: In function 'bd2802_probe':
drivers/leds/leds-bd2802.c:700: warning: ignoring return value of 'gpio_request', declared with attribute warn_unused_result
drivers/leds/leds-bd2802.c:701: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/input/mouse/gpio_mouse.c: In function 'gpio_mouse_probe':
drivers/input/mouse/gpio_mouse.c:93: warning: ignoring return value of 'gpio_direction_input', declared with attribute warn_unused_result
sound/soc/codecs/tlv320aic3x.c: In function 'aic3x_probe':
sound/soc/codecs/tlv320aic3x.c:1385: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/i2c/busses/i2c-gpio.c: In function 'i2c_gpio_setsda_dir':
drivers/i2c/busses/i2c-gpio.c:26: warning: ignoring return value of 'gpio_direction_input', declared with attribute warn_unused_result
drivers/i2c/busses/i2c-gpio.c:28: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/i2c/busses/i2c-gpio.c: In function 'i2c_gpio_setscl_dir':
drivers/i2c/busses/i2c-gpio.c:49: warning: ignoring return value of 'gpio_direction_input', declared with attribute warn_unused_result
drivers/i2c/busses/i2c-gpio.c:51: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/i2c/busses/i2c-gpio.c: In function 'i2c_gpio_probe':
drivers/i2c/busses/i2c-gpio.c:108: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/i2c/busses/i2c-gpio.c:111: warning: ignoring return value of 'gpio_direction_input', declared with attribute warn_unused_result
drivers/i2c/busses/i2c-gpio.c:116: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/i2c/busses/i2c-gpio.c:119: warning: ignoring return value of 'gpio_direction_input', declared with attribute warn_unused_result
drivers/input/keyboard/matrix_keypad.c: In function '__activate_col':
drivers/input/keyboard/matrix_keypad.c:54: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/input/keyboard/matrix_keypad.c:57: warning: ignoring return value of 'gpio_direction_input', declared with attribute warn_unused_result
drivers/input/keyboard/matrix_keypad.c: In function 'init_matrix_gpio':
drivers/input/keyboard/matrix_keypad.c:317: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/input/keyboard/matrix_keypad.c:329: warning: ignoring return value of 'gpio_direction_input', declared with attribute warn_unused_result
sound/soc/codecs/tlv320dac33.c: In function 'dac33_i2c_probe':
sound/soc/codecs/tlv320dac33.c:1563: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/input/touchscreen/cy8ctmg110_ts.c: In function 'cy8ctmg110_power':
drivers/input/touchscreen/cy8ctmg110_ts.c:71: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
sound/soc/codecs/tpa6130a2.c: In function 'tpa6130a2_probe':
sound/soc/codecs/tpa6130a2.c:402: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/i2c/busses/i2c-pca-platform.c: In function 'i2c_pca_pf_probe':
drivers/i2c/busses/i2c-pca-platform.c:216: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/media/radio/si4713-i2c.c: In function 'si4713_probe':
drivers/media/radio/si4713-i2c.c:2018: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/hwmon/sht15.c: In function 'sht15_connection_reset':
drivers/hwmon/sht15.c:128: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/hwmon/sht15.c: In function 'sht15_transmission_start':
drivers/hwmon/sht15.c:166: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/hwmon/sht15.c: In function 'sht15_wait_for_response':
drivers/hwmon/sht15.c:202: warning: ignoring return value of 'gpio_direction_input', declared with attribute warn_unused_result
drivers/hwmon/sht15.c: In function 'sht15_update_single_val':
drivers/hwmon/sht15.c:248: warning: ignoring return value of 'gpio_direction_input', declared with attribute warn_unused_result
drivers/hwmon/sht15.c: In function 'sht15_ack':
drivers/hwmon/sht15.c:414: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/hwmon/sht15.c:422: warning: ignoring return value of 'gpio_direction_input', declared with attribute warn_unused_result
drivers/hwmon/sht15.c: In function 'sht15_end_transmission':
drivers/hwmon/sht15.c:432: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/hwmon/sht15.c: In function 'sht15_probe':
drivers/hwmon/sht15.c:563: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/regulator/max8952.c: In function 'max8952_pmic_probe':
drivers/regulator/max8952.c:228: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/regulator/max8952.c:246: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/regulator/max8952.c:252: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/rtc/rtc-v3020.c: In function 'v3020_gpio_map':
drivers/rtc/rtc-v3020.c:132: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/rtc/rtc-v3020.c: In function 'v3020_gpio_write_bit':
drivers/rtc/rtc-v3020.c:156: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/rtc/rtc-v3020.c: In function 'v3020_gpio_read_bit':
drivers/rtc/rtc-v3020.c:168: warning: ignoring return value of 'gpio_direction_input', declared with attribute warn_unused_result
drivers/usb/otg/gpio_vbus.c: In function 'gpio_vbus_probe':
drivers/usb/otg/gpio_vbus.c:249: warning: ignoring return value of 'gpio_direction_input', declared with attribute warn_unused_result
drivers/usb/otg/gpio_vbus.c:270: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/w1/masters/w1-gpio.c: In function 'w1_gpio_write_bit_dir':
drivers/w1/masters/w1-gpio.c:27: warning: ignoring return value of 'gpio_direction_input', declared with attribute warn_unused_result
drivers/w1/masters/w1-gpio.c:29: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/w1/masters/w1-gpio.c: In function 'w1_gpio_probe':
drivers/w1/masters/w1-gpio.c:67: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/w1/masters/w1-gpio.c:70: warning: ignoring return value of 'gpio_direction_input', declared with attribute warn_unused_result
drivers/net/phy/mdio-gpio.c: In function 'mdio_dir':
drivers/net/phy/mdio-gpio.c:48: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/net/phy/mdio-gpio.c:50: warning: ignoring return value of 'gpio_direction_input', declared with attribute warn_unused_result
drivers/net/phy/mdio-gpio.c: In function 'mdio_gpio_bus_init':
drivers/net/phy/mdio-gpio.c:126: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/media/video/via-camera.c: In function 'via_sensor_power_setup':
drivers/media/video/via-camera.c:208: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/media/video/via-camera.c:209: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/net/wireless/p54/p54spi.c: In function 'p54spi_probe':
drivers/net/wireless/p54/p54spi.c:641: warning: ignoring return value of 'gpio_direction_output', declared with attribute warn_unused_result
drivers/net/wireless/p54/p54spi.c:642: warning: ignoring return value of 'gpio_direction_input', declared with attribute warn_unused_result

Introduced by commit 0fdae42d361bbb431ca0ab0efed5126a94821177 ("gpiolib:
annotate gpio-intialization with __must_check").

We used to try to fix most of the bad code *before* introducing these
warnings ... this is just making it much harder to see "real" warnings.

-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au
http://www.canb.auug.org.au/~sfr/