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)