e1000e: test for unusable MSI support
Some systems do not like 82571/2 use of 16-bit MSI messages and some other systems claim to support MSI, but neither really works. Setup a test MSI handler to detect whether or not MSI is working properly, and if not, fallback to legacy INTx interrupts. Signed-off-by: Bruce Allan <bruce.w.allan@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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