ide: make drive->dn read only
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@oracle.com>
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Tested-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/ide/ide-proc.c b/drivers/ide/ide-proc.c
index 0363d73..e73016c 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),
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 46b771d..25046ff 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -943,6 +943,10 @@ 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); \
