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
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