From: "Maciej S. Szmigiero" <maciej.szmigiero@xxxxxxxxxx> Currently, the libata.fua parameter isn't runtime-writable, so a system restart is required in order to toggle it. This unnecessarily complicates testing how drives behave with FUA on and off. Let's make this parameter R/W instead, like many others in the kernel. Example usage: Disable the parameter: echo 0 >/sys/module/libata/parameters/fua Revalidate disk cache settings: F=/sys/class/scsi_disk/0\:0\:0\:0/cache_type; echo `cat $F` >$F [Damien] Enabling fua support by setting libata.fua to 1 will have no effect if the libata module is loaded with libata.force=[ID]nofua, which disables fua support for the ata device(s) identified with ID or all ata devices if no ID is specified. Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@xxxxxxxxxx> Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx> --- drivers/ata/libata-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 6008f7ed1c42..1bb9616b10d9 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -128,7 +128,7 @@ module_param(atapi_passthru16, int, 0444); MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices (0=off, 1=on [default])"); int libata_fua = 0; -module_param_named(fua, libata_fua, int, 0444); +module_param_named(fua, libata_fua, int, 0644); MODULE_PARM_DESC(fua, "FUA support (0=off [default], 1=on)"); static int ata_ignore_hpa; -- 2.37.3
