[PATCH 09/11] block: bypass the STABLE_WRITES flag for protection information

[Martin K. Petersen]

Christoph,

> Currently registering a checksum-enabled (aka PI) integrity profile sets
> the QUEUE_FLAG_STABLE_WRITE flag, and unregistering it clears the flag.
> This can incorrectly clear the flag when the driver requires stable
> writes even without PI, e.g. in case of iSCSI or NVMe/TCP with data
> digest enabled.
>
> Fix this by looking at the csum_type directly in bdev_stable_writes and
> not setting the queue flag.  Also remove the blk_queue_stable_writes
> helper as the only user in nvme wants to only look at the actual
> QUEUE_FLAG_STABLE_WRITE flag as it inherits the integrity configuration
> by other means.

Looks OK.

Reviewed-by: Martin K. Petersen <martin.petersen at oracle.com>

-- 
Martin K. Petersen	Oracle Linux Engineering