Dan Williams wrote:
Something is broken if we take this path. This routine could stand to have a WARN_ONCE(), because if it is ever called there is something is wrong with the raid6 offload driver. The intent is that the asynchronous recovery routines will perform an early check to see if the recovery can be offloaded (with a series of calls to async_xor/async_pq). If not we fall back to the optimized synchronous recovery routines (raid6_2data_recov, raid6_datap_recov). The only time this path will be taken is if we have decided to perform asynchronous recovery but at a later call to async_pq the offload driver reports it has run out of descriptors.
That doesn't explain what you expect the code to do. It still doesn't make sense to me.
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