Hi Linus, Posted twice to linux-scsi and once to lkml - doesn't seem to have been picked up yet. Similar to the problem with dbg_lvl fixed in commit 66dca9b8c50b5e59d3bea8b21cee5c6dae6c9c46 last year. /sys/bus/pci/drivers/megaraid_sas/poll_mode_io defaults to being world-writable, which seems bad (letting any user affect kernel driver behavior). This turns off group and user write permissions, so that on typical production systems only root can write to it. Signed-off-by: Bryn M. Reeves Cheers, Bryn.