From: Suman Anna <s-anna@ti.com>
Date: Wed, 22 Oct 2014 22:22:34 +0000 (-0500)
Subject: iommu/omap: Fix bus error on debugfs access of unattached IOMMU
X-Git-Tag: omap-for-v3.20/drop-legacy-3517~103^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c5cf5c5377fbd0a1ff2a09ad1f0c7e261aabc567;p=pandora-kernel.git

iommu/omap: Fix bus error on debugfs access of unattached IOMMU

Any debugfs access on an OMAP IOMMU that is not enabled (done during
attach) results in a bus error due to access of registers without
the clock or the reset enabled for the respective IOMMU. So, add a
check to make sure the IOMMU is enabled/attached by a client device.
This gracefully prints a "Operation not permitted" trace when the
corresponding IOMMU is not enabled.

Signed-off-by: Suman Anna <s-anna@ti.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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