ubiblock: null pointer dereference using scatterlist in work_queue

[hch]

On Thu, Aug 10, 2023 at 12:34:44AM +0200, Richard Weinberger wrote:
> Will do so! So far I managed to get UBIblock work with scsi_kmap_atomic_sg().
> Sadly now with kmap'ed memory a bounce buffer is needed since IO in UBI/MTD can sleep.
> Is there a strong reason why scsi_kmap_atomic_sg() needs IRQs disabled?

I don't think it needs irqs disabled.  Also if you switch from the
deprecated kmap_atomic to kmap_local first you can sleep and don't
need bounce buffers.