linux-kernel - Regression in v4.2-rc1 caused by hierarchical irqdomain changes

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Date:	Mon, 27 Jul 2015 16:21:07 +0100
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org
Subject: Regression in v4.2-rc1 caused by hierarchical irqdomain changes

A git bisect just pointed me at commit d32932d02e18 ("x86/irq: Convert
IOAPIC to use hierarchical irqdomain interfaces") as the reason for why
the trackpad on my Dell XPS13 is no longer working with v4.2-rc1.

I'm now seeing the following errors when booting,

[    1.615017] i2c_designware INT3433:00: controller timed out
[    1.642496] i2c_designware INT3433:00: timeout in disabling adapter        
[    1.642500] i2c_hid i2c-DLL0665:01: hid_descr_cmd failed

I tried commit d32932d02e18~1, which works, and things definitely break
starting with commit d32932d02e18.

Any suggestions or requests to try and diagnose why the irqdomain
changes broke this i2c controller driver?

-- 
Matt Fleming, Intel Open Source Technology Center
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