CSR18_PIFS        238 drivers/net/wireless/ralink/rt2x00/rt2400pci.h #define CSR18_PIFS			FIELD32(0xffff0000)
CSR18_PIFS        315 drivers/net/wireless/ralink/rt2x00/rt2500pci.h #define CSR18_PIFS			FIELD32(0x001f0000)