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[Adam Lee <adam.lee@xxxxxxxxxxxxx>]

Mainline:

commit 5152970538a5e16c03bbcb9f1c780489a795ed40
Author: Chris Ball <chris@xxxxxxxxxx>
Date:   Thu Sep 4 17:11:53 2014 +0100

    mfd: rtsx_pcr: Fix MSI enable error handling

    pci_enable_msi() can return failure with both positive and negative
    integers -- it returns 0 for success -- but is only tested here for
    "if (ret < 0)".  This causes us to try to use MSI on the RTS5249 SD
    reader in the Dell XPS 11 when enabling MSI failed, causing:

    [    1.737110] rtsx_pci: probe of 0000:05:00.0 failed with error
-110


patch has been submitted to kernel-team@

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https://bugs.launchpad.net/bugs/1366841

Title:
  [Dell XPS 11] Card reader RTS5249 doesn't work because failed to
  enable MSI

Status in “linux” package in Ubuntu:
  Invalid
Status in “linux” source package in Trusty:
  In Progress
Status in “linux” source package in Utopic:
  Invalid

Bug description:
  This patch has been submitted upstream and is queued up for inclusion
  in mfd-next:

  https://git.kernel.org/cgit/linux/kernel/git/lee/mfd.git/commit/?h
  =for-mfd-next&id=eb61b3276e099d937fcdae2c67aec4766bba2dc3

  Adam: backporting "034cd97ebda4062eb4402a6cf963ccd262caa86a PCI/MSI:
  Remove pci_enable_msi_block()" from mainline/master works too.

  Please include this patch in Trusty and Utopic. (Adam: Utopic doesn't
  have this issue.)

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