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Subject: Re: dd hangs when reading large partitions
To:     Bart Van Assche <bvanassche@acm.org>,
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        Avri Altman <avri.altman@wdc.com>,
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From:   Marc Gonzalez <marc.w.gonzalez@free.fr>
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Date:   Sat, 9 Feb 2019 12:57:46 +0100
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On 08/02/2019 16:49, Bart Van Assche wrote:

> On Fri, 2019-02-08 at 16:33 +0100, Marc Gonzalez wrote:
>
>> Does anyone see what's going sideways in the no-flag case?
> 
> Does this problem only occur with block devices backed by the UFS driver
> or does this problem also occur with other block drivers?

So far, I've only been able to test with UFS storage.
The board has no PATA/SATA. SDHC is not supported yet.

With Jeffrey's help, I was able to get a semi-functional
USB3 stack running. I'll test USB3 mass storage on Monday.

FWIW, I removed most (all?) locks from the UFSHC driver,
by dropping scaling and gating support. I could also
drop runtime suspend, if someone thinks that could help,
but I'm thinking the problem might be in the mm or block
layers?

(It doesn't look like a locking problem, but more a memory
exhaustion problem.)

Regards.