linux-kernel - 2.6.38 regression caused by commit 415e12b

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Message-ID: <20110228014218.GA11083@xanatos>
Date:	Sun, 27 Feb 2011 17:42:18 -0800
From:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-usb@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ozan Caglayan <ozan@...dus.org.tr>
Subject: 2.6.38 regression caused by commit 415e12b

I'm having an issue with an xHCI (USB 3.0 host controller) Express Card.
This card works fine on 2.6.37, but on 2.6.38-rc5, when I plug in the
card, I get this output in dmesg:

Feb 22 16:32:28 xanatos kernel: [  119.345996] irq 23: nobody cared (try booting with the "irqpoll" option)
Feb 22 16:32:28 xanatos kernel: [  119.346002] Pid: 0, comm: kworker/0:0 Not tainted 2.6.38-rc5+ #745
Feb 22 16:32:28 xanatos kernel: [  119.346005] Call Trace:
Feb 22 16:32:28 xanatos kernel: [  119.346007]  <IRQ>  [<ffffffff8109a1f6>] ? __report_bad_irq+0x26/0xa0
Feb 22 16:32:28 xanatos kernel: [  119.346019]  [<ffffffff8109a3fc>] ? note_interrupt+0x18c/0x1d0
Feb 22 16:32:28 xanatos kernel: [  119.346024]  [<ffffffff8109ad7d>] ? handle_fasteoi_irq+0xcd/0x100
Feb 22 16:32:28 xanatos kernel: [  119.346029]  [<ffffffff8100543d>] ? handle_irq+0x1d/0x30
Feb 22 16:32:28 xanatos kernel: [  119.346032]  [<ffffffff81004bb8>] ? do_IRQ+0x58/0xd0
Feb 22 16:32:28 xanatos kernel: [  119.346037]  [<ffffffff8149f5d3>] ? ret_from_intr+0x0/0xe
Feb 22 16:32:28 xanatos kernel: [  119.346040]  <EOI>  [<ffffffff8126f2d0>] ? acpi_idle_enter_c1+0x7e/0x99
Feb 22 16:32:28 xanatos kernel: [  119.346048]  [<ffffffff8126f2b2>] ? acpi_idle_enter_c1+0x60/0x99
Feb 22 16:32:28 xanatos kernel: [  119.346054]  [<ffffffff8138ac92>] ? cpuidle_idle_call+0x82/0xf0
Feb 22 16:32:28 xanatos kernel: [  119.346059]  [<ffffffff81001906>] ? cpu_idle+0x56/0xb0
Feb 22 16:32:28 xanatos kernel: [  119.346064]  [<ffffffff8149861b>] ? start_secondary+0x1c1/0x1c8
Feb 22 16:32:28 xanatos kernel: [  119.346068]  [<ffffffff81263386>] ? acpi_ns_parse_table+0x2e/0x34
Feb 22 16:32:28 xanatos kernel: [  119.346073]  [<ffffffff81267a8c>] ? acpi_load_tables+0x9c/0x15d
Feb 22 16:32:28 xanatos kernel: [  119.346076] handlers:
Feb 22 16:32:28 xanatos kernel: [  119.346078] [<ffffffffa0123500>] (usb_hcd_irq+0x0/0x70 [usbcore])
Feb 22 16:32:28 xanatos kernel: [  119.346100] Disabling IRQ #23

This happens before the xHCI driver has a chance to start PCI
initialization.

I've been trying to bisect this on a slow laptop, so I haven't had a
chance to test with the latest tree from Linus to see if this is already
fixed.  I'll do that later this evening.

I've bisected the issue down to this commit:

415e12b2379239973feab91850b0dce985c6058a is first bad commit
commit 415e12b2379239973feab91850b0dce985c6058a
Author: Rafael J. Wysocki <rjw@...k.pl>
Date:   Fri Jan 7 00:55:09 2011 +0100

    PCI/ACPI: Request _OSC control once for each root bridge (v3)
    
    Move the evaluation of acpi_pci_osc_control_set() (to request control of
    PCI Express native features) into acpi_pci_root_add() to avoid calling
    it many times for the same root complex with the same arguments.
    Additionally, check if all of the requisite _OSC support bits are set
    before calling acpi_pci_osc_control_set() for a given root complex.
    
    References: https://bugzilla.kernel.org/show_bug.cgi?id=20232
    Reported-by: Ozan Caglayan <ozan@...dus.org.tr>
    Tested-by: Ozan Caglayan <ozan@...dus.org.tr>
    Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
    Signed-off-by: Jesse Barnes <jbarnes@...tuousgeek.org>

:040000 040000 531c48ec0c23b72f0ca1b5f33828ea63808e4033 7ffa298e34dd842e1f84f0b1fea6dc5af1f70514 M	drivers
:040000 040000 4e484ec0cab0ebc7c82a029c4860802617b7aaf2 01b429bcaeb7b50af04667664cf25453058e803f M	include

lspci from a kernel where the Express Card works is attached.

Sarah Sharp

View attachment "lspci.txt" of type "text/plain" (14474 bytes)