Re: [PATCH] nvme-multipath: revalidate head zones after unfreezing the head queue

[Keith Busch]

On Wed, Sep 30, 2026 at 07:26:47AM +0100, Palla Raghunath wrote:
> When a namespace on a multipath controller is updated,
> nvme_update_ns_info() freezes the head disk queue, commits the new
> limits, and then calls nvme_mpath_revalidate_zones() before it
> unfreezes the queue again.
> 
> That is the wrong way round for blk_revalidate_disk_zones(). It starts
> a limits update, which takes q->limits_lock, and it freezes the queue
> itself while updating the zone resources. The block layer takes
> limits_lock before freezing the queue, never the other way around, so
> calling it with the head queue already frozen reverses that order.

Thanks, applied to nvme-7.3.