r0 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000040)='/sys/class/ieee80211', 0x0, 0x0)
openat$cgroup_ro(r0, &(0x7f0000000300)='blkio.bfq.io_serviced_recursive\x00', 0x0, 0x0)