APPLIED: [Oneiric][SRU][PATCH 0/2] Avoid unnecessary warnings in xHCI

[Tim Gardner]

On 02/09/2012 01:46 PM, leann.ogasawara at canonical.com wrote:
> From: Leann Ogasawara<leann.ogasawara at canonical.com>
>
> BugLink: http://bugs.launchpad.net/bugs/929656
>
> == Oneiric SRU Justification ==
>
> When running Oneiric on a Chief River (Ivy Bridge/Panther Point)
> platform, the following messages are printed to dmesg which are harmless
> but could cause user concern. It's been requested we cherry-pick two
> upstream patches to eliminate these messages.
>
> "[ 1.037314] xhci_hcd 0000:00:14.0: Failed to enable MSI-X"
>
> "[ 1.037314] WARN: short transfer on control ep"
>
> == Fix ==
>
> The following upstream patches remove these warnings.  They have not
> been sent to upstream stable, I plan to do so shortly.
>
>    commit 3b9783b277e66731891ab42eeaacebbdcdd6e629
>    Author: Sarah Sharp<sarah.a.sharp at linux.intel.com>
>    Date: Thu Dec 22 15:02:13 2011 -0800
>
>      xhci: Remove warnings about MSI and MSI-X capabilities.
>
>    commit 2a9227a5eeaeb3f91e3a72ceea4fa59016ca5d20
>    Author: Sarah Sharp<sarah.a.sharp at linux.intel.com>
>    Date: Tue Oct 25 13:55:30 2011 +0200
>
>      xhci: Remove scary warnings about transfer issues.
>
> Sarah Sharp (2):
>    xhci: Remove scary warnings about transfer issues.
>    xhci: Remove warnings about MSI and MSI-X capabilities.
>
>   drivers/usb/host/xhci-ring.c |    7 +++----
>   drivers/usb/host/xhci.c      |    8 ++++----
>   2 files changed, 7 insertions(+), 8 deletions(-)
>
> == Impact ==
>
> There should be minimal to no risk of regression as the patches are
> merely lowering the log level from an error message to a debug message.
> The debug messages will only appear if CONFIG_USB_XHCI_HCD_DEBUGGING is
> enabled, which it currently is not.
>
> == Test Case ==
>
> Boot with an unpatched kernel on an Ivy Bridge/Panther Point platform
> and confirm you see something similar to "xhci_hcd 0000:00:14.0: Failed
> to enable MSI-X" on boot and possibly see the "WARN: short transfer on control ep" when conducting normal operations on a USB device.
>
> I have test confirmation from a user with an Ivy Bridge/Panther Point
> platform running Oneiric.  They can confirm the "xhci_hcd 0000:00:14.0: Failed
> to enable MSI-X" error message goes away with a patched kernel.
>


-- 
Tim Gardner tim.gardner at canonical.com