Hi Simon,
On 7/17/2015 3:14 PM, simon@xxxxxxxxxxxxx wrote:
It looks like the firmware 'opt_flags' must be different, so this may be a
contributing factor.
Plot thickens.... kernel config has changed since I built 4.1.0rc7, but I
don't recall doing it or starting a fresh.
/boot/config-4.1.0-rc7+
--
CONFIG_PREVENT_FIRMWARE_BUILD=y
CONFIG_FW_LOADER=y
CONFIG_FIRMWARE_IN_KERNEL=y
CONFIG_EXTRA_FIRMWARE=""
CONFIG_FW_LOADER_USER_HELPER=y
# CONFIG_FW_LOADER_USER_HELPER_FALLBACK is not set
CONFIG_WANT_DEV_COREDUMP=y
CONFIG_ALLOW_DEV_COREDUMP=y
CONFIG_DEV_COREDUMP=y
--
/boot/config-4.2.0-rc1+
--
CONFIG_PREVENT_FIRMWARE_BUILD=y
CONFIG_FW_LOADER=y
CONFIG_FIRMWARE_IN_KERNEL=y
CONFIG_EXTRA_FIRMWARE=""
CONFIG_FW_LOADER_USER_HELPER=y
CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y <------------!!!
CONFIG_WANT_DEV_COREDUMP=y
CONFIG_ALLOW_DEV_COREDUMP=y
CONFIG_DEV_COREDUMP=y
--
Has a kconfig forced a change?.... Grrr
--
$ git blame ./drivers/leds/Kconfig
--
c93d08fa7 (Milo(Woogyom) Kim 2013-02-05 18:01:23 +0900 228) config
LEDS_LP55XX_COMMON
33b3a561f (Kim, Milo 2013-07-09 02:11:37 -0700 229)
tristate "Common Driver for TI/National LP5521/5523/55231/5562/8501"
33b3a561f (Kim, Milo 2013-07-09 02:11:37 -0700 230)
depends on LEDS_LP5521 || LEDS_LP5523 || LEDS_LP5562 || LEDS_LP8501
10c06d178 (Milo(Woogyom) Kim 2013-02-05 19:17:20 +0900 231)
select FW_LOADER
b67893206 (Milo Kim 2015-06-28 17:39:14 -0700 232)
select FW_LOADER_USER_HELPER_FALLBACK
<-----!!!!
c93d08fa7 (Milo(Woogyom) Kim 2013-02-05 18:01:23 +0900 233) help
33b3a561f (Kim, Milo 2013-07-09 02:11:37 -0700 234)
This option supports common operations for LP5521/5523/55231/5562/8501
c93d08fa7 (Milo(Woogyom) Kim 2013-02-05 18:01:23 +0900 235)
devices.
--
So in summary this problem is showing up now as the 'User Helper Fallback'
is now forced on, obviously the underlying problem needs to be fixed - but
I don't know when it crept in.
The 'CONFIG_FW_LOADER_USER_HELPER_FALLBACK' enables to load firmware
data manually by accessing /sys/class/firmware/<name>/data. It runs in
case the firmware file is missing.
This user helper fallback will be enabled if one of LP55xx driver is
included in your dot config. Please see my patch below.
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/leds?id=b67893206fc0a0e8af87130e67f3d8ae553fc87c
However, I'm not sure why this affects your system lockup. Can I have
more details?
Best regards,
Milo
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