linux-kernel - Re: [PATCH 1/2] iommu/s390: Use iommu_group_get_for_dev() in s390_iommu_add

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Date:   Tue, 27 Jun 2017 17:16:58 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Gerald Schaefer <gerald.schaefer@...ibm.com>
Cc:     Sebastian Ott <sebott@...ux.vnet.ibm.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        jroedel@...e.de
Subject: Re: [PATCH 1/2] iommu/s390: Use iommu_group_get_for_dev() in
 s390_iommu_add_device()

Hi Gerald,

sorry for the delay. Answers inline.

On Fri, Jun 16, 2017 at 07:33:01PM +0200, Gerald Schaefer wrote:
> Seems pretty straightforward, so
> Reviewed-by: Gerald Schaefer <gerald.schaefer@...ibm.com>

Thanks, I add it to the patch.

> With generic_device_group() returning NULL in case the allocation failed,
> this part of iommu_group_get_for_dev() would then happily dereference the
> NULL pointer, because IS_ERR(group) would be false:

Yeah, you are right, this is a bug. I'll send a patch to fix this
shortly. I don't remember whether there was a good reason to drop the
error values in the device_group call-backs. Probably there is none and
I can just pass the error value up instead of NULLing them out.

	Joerg