The IDE core always sets ->dn correctly so changing it is never required. Setting it to a different value than assigned by IDE core is very likely to result in data corruption (due to wrong transfer timings being set on the controller etc.) Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> --- include/linux/ide.h | 4 ++++ drivers/ide/ide-proc.c | 2 +- 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/include/linux/ide.h b/include/linux/ide.h index 06dae6438557..a254841bd315 100644 --- a/include/linux/ide.h +++ b/include/linux/ide.h @@ -945,6 +945,10 @@ ide_devset_get(_name, _field); \ ide_devset_set(_name, _field); \ IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) +#define ide_devset_ro_field(_name, _field) \ +ide_devset_get(_name, _field); \ +IDE_DEVSET(_name, 0, get_##_name, NULL) + #define ide_devset_rw_flag(_name, _field) \ ide_devset_get_flag(_name, _field); \ ide_devset_set_flag(_name, _field); \ diff --git a/drivers/ide/ide-proc.c b/drivers/ide/ide-proc.c index 11a801aa92d8..15c17f3781ee 100644 --- a/drivers/ide/ide-proc.c +++ b/drivers/ide/ide-proc.c @@ -206,7 +206,7 @@ static int set_xfer_rate (ide_drive_t *drive, int arg) ide_devset_rw(current_speed, xfer_rate); ide_devset_rw_field(init_speed, init_speed); ide_devset_rw_flag(nice1, IDE_DFLAG_NICE1); -ide_devset_rw_field(number, dn); +ide_devset_ro_field(number, dn); static const struct ide_proc_devset ide_generic_settings[] = { IDE_PROC_DEVSET(current_speed, 0, 70), -- 2.11.0