linux-kernel - iommu/exynos: Checking a device_link_add() call in exynos_iommu_add

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Date:   Fri, 18 Oct 2019 08:30:42 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org,
        Jörg Rödel <joro@...tes.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Aditya Pakki <pakki001@....edu>, Kangjie Lu <kjlu@....edu>,
        Navid Emamdoost <emamd001@....edu>,
        Stephen McCamant <smccaman@....edu>
Subject: iommu/exynos: Checking a device_link_add() call in
 exynos_iommu_add_device()

Hello,

I tried another script for the semantic patch language out.
This source code analysis approach points out that the implementation
of the function “exynos_iommu_add_device” contains still
an unchecked call of the function “device_link_add”.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/iommu/exynos-iommu.c?id=0e2adab6cf285c41e825b6c74a3aa61324d1132c#n1253
https://elixir.bootlin.com/linux/v5.4-rc2/source/drivers/iommu/exynos-iommu.c#L1253

How do you think about to improve it?

* Which error code would you like to return for a failed
  device link addition at this place?

* Will it be needed to delete any links as exception handling?

Regards,
Markus