Re: ubiblock: null pointer dereference using scatterlist in work_queue

Richard Weinberger
2023-08-09T22:34:59Z

----- Ursprüngliche Mail -----
> Von: "hch" <hch@lst.de>
> Yes. So the code needs to stop using sg_virt to work on highmem
> setups and do the equivalent of scsi_kmap_atomic_sg. Best way
> forward is probably to move scsi_kmap_atomic_sg to lib/scatterlist.c
> (and also convert it to kmap_local instead of kmap_atomic while you're
> at it) and then use that in ubiblock

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?

Thanks,
//richard