UBI: make the control character device non-seekable
This patch makes the UBI control device (/dev/ubi_ctrl) non-seekable.
The seek operation does is not applicable to this file, so it is
cleaner to explicitly return error (which the added 'no_llseek()')
does than trying to change the position (which the removed
'default_llseek()' does).
This is an API break, but the only known user of this interface is
mtd-utils which does not need the seeking functionality. And any app
which relies on this is broken, but I'm not aware of such apps.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index af9fb0f..9a17032 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -1100,5 +1100,5 @@
.owner = THIS_MODULE,
.unlocked_ioctl = ctrl_cdev_ioctl,
.compat_ioctl = ctrl_cdev_compat_ioctl,
- .llseek = noop_llseek,
+ .llseek = no_llseek,
};