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To: Alexey Kardashevskiy <aik@ozlabs.ru>, linuxppc-dev@lists.ozlabs.org
From: Michael Ellerman <mpe@ellerman.id.au>
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>, Wei Yang <weiyang@linux.vnet.ibm.com>,
 Gavin Shan <gwshan@linux.vnet.ibm.com>
Subject: Re: [kernel] powerpc/iommu: Set default DMA offset in dma_dev_setup
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Date: Thu, 27 Aug 2015 19:37:54 +1000 (AEST)
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On Thu, 2015-27-08 at 06:01:16 UTC, Alexey Kardashevskiy wrote:
> "powerpc/iommu: Cleanup setting of DMA base/offset" expects that

This should be:

Commit e91c25111aa3 "powerpc/iommu: Cleanup setting of DMA base/offset" ...

> the default DMA offset is set from pnv_ioda_setup_bus_dma() which
> is correct unless it is SRIOV where the code flow is different - at
> the moment when pnv_ioda_setup_bus_dma() is called, there is no PE for
> the just created VF.
> 
> This adds missing set_dma_offset() to pnv_pci_ioda_dma_dev_setup()
> to cover the case of SRIOV.
> 
> Note that we still need set_dma_offset() in pnv_ioda_setup_bus_dma()
> as at the boot time pnv_pci_ioda_dma_dev_setup() is called when no PE
> was created yet, this happens at the PHB fixup stage.

And here we should have:

Fixes: e91c25111aa3 ("powerpc/iommu: Cleanup setting of DMA base/offset")

> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
> ---
> 
> Makes sense to squash it to "powerpc/iommu: Cleanup setting of DMA base/offset".

We don't squash things that are already in next.

I've fixed the change log up with my comments above and your reworded
explanation.

cheers