On Wed, Mar 04, 2020 at 10:51:14AM +0800, light.hsieh@mediatek.com wrote:

From: Light Hsieh <redacted>

For storage device with write-protection support, e.g. eMMC, register
check_disk_range_wp() in struct block_device_operations for checking
write-protection status. When creating block device for a partition, set
read/write policy according to result of check_disk_range_wp() operation
(if registered).

Without this patch, ro attribute is not set for created block device of
write-protected partition. User perform asynchronous buffered write to
such partition won't get immediate error and therefore he won't be awared
that write is not actually performed.
With this patch, ro attribute is set for created block device of
write-protected partition. User perform asynchronous buffered write to
such partition will get immediate error and therefore he will be awared.

NAK.  This is complete BS.  Partitions are a complete software concepts
and idiotic features like a range read only should not interact with it
at all (and I urge all Linux users to never make use of such broken
features, so the less support we have for them, the better).