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On Intel Tangier the MMC host controller is wired up to irq 0. But
several other devices have irq 0 associated as well due to a bogus PCI
configuration.
The first initialized driver will acquire irq 0 and make it
unavailable for other devices. If the sdhci driver is not the first
one it will fail to acquire the interrupt and therefor be non
functional.
Add a quirk to the pci irq enable function which denies irq 0 to
anything else than the MMC host controller driver on Tangier
platforms.
Fixes: 90b9aacf912a (serial: 8250_pci: add Intel Tangier support)
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Link: http://lkml.kernel.org/r/1438161409-4671-2-git-send-email-andriy.shevchenko@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
39d9b77b8d