Re: [PATCH -next 4/5] blk-iocost: fix sleeping in atomic context warnning in ioc_qos_write()

[Christoph Hellwig]

This seems a little convoluted to me.  I'd suggest to add a new
sleeping lock that protects the updates, then you just take the
spinlock after parsing without much other changes.

(The same comment also applies to patch 5).