It is told that on Apr 7, "Martin Husemann" wrote thus:

> Yeah - that seems to be wdc->dma_status and chp->ch_flags in this case.
> I wonder if that is also the cause for some freezes I saw on shark.
>
> Jukka, could you try if changing those two struct members to volatile
> helps?

Yes, it works if just ch_flags or both of them are volatile.