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Date:   Mon, 15 Jul 2019 18:58:23 +0200
From:   Christoph Hellwig <>
To:     "Martin K . Petersen" <>
Cc:     Sagi Grimberg <>, Max Gurtovoy <>,
        Bart Van Assche <>,,,,,,
Subject: Re: properly communicate queue limits to the DMA layer v2

On Mon, Jun 17, 2019 at 02:19:52PM +0200, Christoph Hellwig wrote:
> Hi Martin,
> we've always had a bit of a problem communicating the block layer
> queue limits to the DMA layer, which needs to respect them when
> an IOMMU that could merge segments is used.  Unfortunately most
> drivers don't get this right.  Oddly enough we've been mostly
> getting away with it, although lately dma-debug has been catching
> a few of those issues.

Ping?  What happened to this set of bug fixes?

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