Re: dd hangs when reading large partitions

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On 1/19/19 2:56 AM, Christoph Hellwig wrote:
> On Fri, Jan 18, 2019 at 10:48:15AM -0700, Jens Axboe wrote:
>> It's UFS that totally buggy, if you look at its queuecommand, it does:
>>
>>         if (!down_read_trylock(&hba->clk_scaling_lock))                         
>>                 return SCSI_MLQUEUE_HOST_BUSY;
>>
>> UFS either needs to get fixed up, or we'll want a way to do something like
>> the below.
> 
> I think the right answer is to just revert the offending patch instead
> of papering over it in the SCSI code.

I fully agree.

-- 
Jens Axboe




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