[PATCH] mtd: require write permissions for locking and badblock ioctls

[Rafał Miłecki]

On 03.03.2021 16:57, Michael Walle wrote:
> MEMLOCK, MEMUNLOCK and OTPLOCK modify protection bits. Thus require
> write permission. Depending on the hardware MEMLOCK might even be
> write-once, e.g. for SPI-NOR flashes with their WP# tied to GND. OTPLOCK
> is always write-once.
> 
> MEMSETBADBLOCK modifies the bad block table.
> 
> Fixes: f7e6b19bc764 ("mtd: properly check all write ioctls for permissions")
> Signed-off-by: Michael Walle <michael at walle.cc>

Should be fine for OpenWrt tools to my best knowledge (and quick testing).

Acked-by: Rafał Miłecki <rafal at milecki.pl>