linux-kernel - Re: [PATCH] iommu: rockchip: fix building without CONFIG

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Date:   Thu, 3 May 2018 14:46:24 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Heiko Stuebner <heiko@...ech.de>,
        Jeffy Chen <jeffy.chen@...k-chips.com>,
        Robin Murphy <robin.murphy@....com>,
        Tomasz Figa <tfiga@...omium.org>,
        Simon Xue <xxm@...k-chips.com>,
        Marc Zyngier <marc.zyngier@....com>,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu: rockchip: fix building without CONFIG_OF

On Wed, Apr 04, 2018 at 12:23:53PM +0200, Arnd Bergmann wrote:
> We get a build error when compiling the iommu driver without CONFIG_OF:
> 
> drivers/iommu/rockchip-iommu.c: In function 'rk_iommu_of_xlate':
> drivers/iommu/rockchip-iommu.c:1101:2: error: implicit declaration of function 'of_dev_put'; did you mean 'of_node_put'? [-Werror=implicit-function-declaration]
> 
> This replaces the of_dev_put() with the equivalent platform_device_put(),
> and adds an error check for of_find_device_by_node() returning NULL,
> which seems to be appropriate here given that we pass the device into
> platform_get_drvdata() next, and that of_find_device_by_node() might
> theoretically return a NULL pointer.
> 
> Fixes: 5fd577c3eac3 ("iommu/rockchip: Use OF_IOMMU to attach devices automatically")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> This warning appears to only have been introduced in linux-next after
> the merge window opened.
> ---
>  drivers/iommu/rockchip-iommu.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)

Changed patch according to Robins comments and applied it, thanks.