From: Joerg Roedel <jroedel@suse.de>
Date: Mon, 29 Jun 2015 08:16:08 +0000 (+0200)
Subject: iommu: Ignore -ENODEV errors from add_device call-back
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~58^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=38667f18900afe172a4fe44279b132b4140f920f;p=pandora-kernel.git

iommu: Ignore -ENODEV errors from add_device call-back

The -ENODEV error just means that the device is not
translated by an IOMMU. We shouldn't bail out of iommu
driver initialization when that happens, as this is a common
scenario on ARM.

Not returning -ENODEV in the drivers would be a bad idea, as
the IOMMU core would have no indication whether a device is
translated or not. This indication is not used at the
moment, but will probably be in the future.

Fixes: 19762d7 ("iommu: Propagate error in add_iommu_group")
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Eric Auger <eric.auger@linaro.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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