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[Daniel Jared Dominguez <1366841@xxxxxxxxxxxxxxxxxx>]

That's just a workaround that manually forces MSI to be disabled. If you look at the lspci output in that other bug report, you see that MSI is also disabled for the card reader in that system:
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. Device 5249 (rev 01)
[snip]
	Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+

The workaround just bypasses the same erroneous line of code in the
driver. The patch mentioned in this bug report is a more correct and
general fix.

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

Title:
  mfd: rtsx_pcr: Fix MSI enable error handling

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

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

  Please include this patch in Trusty and Utopic.

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