Re: Why hid-sensor-hub's IIO doesn't work properly in >= 4.3 (possibly badly bisected)

[Bastien Nocera <hadess@hadess.net>]

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On Fri, 2017-01-20 at 16:52 +0100, Bastien Nocera wrote:
> Hey,
> 
> TLDR:
> # first bad commit: [50ba22479c324c0d9dc8134d519dcba92d83a8a7] Merge
> back earlier ACPI PM material for v4.3.
> 
> hid-sensor-hub devices only start sending events through the IIO
> trigger after a suspend/resume cycle.
> 
> Other IIO drivers don't seem to exhibit those problems.

I had another go, trying to break into the merge commit, and it's
slightly more precise, but still doesn't make any sense to me.

# first bad commit: [3431e490b50356b56084305a2e93b3a980802b22] Merge
branch 'acpi-scan' into acpi-pm

Any ideas? I'm running out of them...

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git bisect start
# good: [25e5eaf19962bd48788371e4f516bdd89ce248bc] ALSA: sparc: Add missing kfree in error path
git bisect good 25e5eaf19962bd48788371e4f516bdd89ce248bc
# bad: [3431e490b50356b56084305a2e93b3a980802b22] Merge branch 'acpi-scan' into acpi-pm
git bisect bad 3431e490b50356b56084305a2e93b3a980802b22
# good: [0755e74b8f04d17cea09fa342a788025b2b50e2e] ALSA: Fix uninintialized error return
git bisect good 0755e74b8f04d17cea09fa342a788025b2b50e2e
# good: [5b4ca4447757019f11a601b0009534ef84bed801] Merge tag 'media/v4.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
git bisect good 5b4ca4447757019f11a601b0009534ef84bed801
# good: [23908db413eccd77084b09c9b0a4451dfb0524c0] Merge tag 'staging-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
git bisect good 23908db413eccd77084b09c9b0a4451dfb0524c0
# good: [13d45f79a2af84de9083310db58b309a61065208] Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds
git bisect good 13d45f79a2af84de9083310db58b309a61065208
# good: [91cca0f0ffa3e485ad9d5b44744f23318c8f99ab] Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 91cca0f0ffa3e485ad9d5b44744f23318c8f99ab
# good: [84e3e9d04d5b5368a1c26f744a98c492052d0523] Merge tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
git bisect good 84e3e9d04d5b5368a1c26f744a98c492052d0523
# good: [d8b2ba7c5928173fe1c12bd2545f5ed85d1c3c7a] IB/core: Destroy ocrdma_dev_id IDR on module exit
git bisect good d8b2ba7c5928173fe1c12bd2545f5ed85d1c3c7a
# good: [9c69481ed0b4e6e525e6d8d4d3d83b612397e67d] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
git bisect good 9c69481ed0b4e6e525e6d8d4d3d83b612397e67d
# good: [761ab7664b30ed907f55da7f6966d4537f36d9ff] Merge branch 'for-linus' of git://git.kernel.dk/linux-block
git bisect good 761ab7664b30ed907f55da7f6966d4537f36d9ff
# good: [3e87ee06d0d6b759471a487ceb8a48ecc5dee1f8] Merge tag 'platform-drivers-x86-v4.2-3' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86
git bisect good 3e87ee06d0d6b759471a487ceb8a48ecc5dee1f8
# good: [5af310a8ee70dd6a588c8ee1d4487a230a7b7b65] Merge tag 'ib-mfd-base-acpi-dma-v4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd into acpi-pm
git bisect good 5af310a8ee70dd6a588c8ee1d4487a230a7b7b65
# good: [17ffc8b083ac299ff798419d1887b7cdcd4ae4d2] Merge branches 'pm-cpuidle', 'pm-cpufreq' and 'acpi-resources'
git bisect good 17ffc8b083ac299ff798419d1887b7cdcd4ae4d2
# good: [68c6b148daa6e45a85b31ef60ed9c9bfd556fff0] ACPI / scan: Move device matching code to bus.c
git bisect good 68c6b148daa6e45a85b31ef60ed9c9bfd556fff0
# good: [1dcc3d3362b0c97e48290f7786be85b4cec2a147] ACPI / bus: Move ACPI bus type registration
git bisect good 1dcc3d3362b0c97e48290f7786be85b4cec2a147
# first bad commit: [3431e490b50356b56084305a2e93b3a980802b22] Merge branch 'acpi-scan' into acpi-pm