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    Subject[PATCH 4.18 107/145] iommu/ipmmu-vmsa: Dont register as BUS IOMMU if machine doesnt have IPMMU-VMSA
    Date
    4.18-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Dmitry Osipenko <digetx@gmail.com>

    commit 5c5c87411488af3cd082221e567498d813d0fe83 upstream.

    This fixes kernel crashing on NVIDIA Tegra if kernel is compiled in
    a multiplatform configuration and IPMMU-VMSA driver is enabled.

    Cc: <stable@vger.kernel.org> # v3.20+
    Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
    Signed-off-by: Joerg Roedel <jroedel@suse.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/iommu/ipmmu-vmsa.c | 7 +++++++
    1 file changed, 7 insertions(+)

    --- a/drivers/iommu/ipmmu-vmsa.c
    +++ b/drivers/iommu/ipmmu-vmsa.c
    @@ -1081,12 +1081,19 @@ static struct platform_driver ipmmu_driv

    static int __init ipmmu_init(void)
    {
    + struct device_node *np;
    static bool setup_done;
    int ret;

    if (setup_done)
    return 0;

    + np = of_find_matching_node(NULL, ipmmu_of_ids);
    + if (!np)
    + return 0;
    +
    + of_node_put(np);
    +
    ret = platform_driver_register(&ipmmu_driver);
    if (ret < 0)
    return ret;

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