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iommu/ipmmu-vmsa: Don't register as BUS IOMMU if machine doesn't have IPMMU-VMSA 

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>
This commit is contained in:
Dmitry Osipenko 2018-07-27 00:19:16 +03:00 committed by Joerg Roedel
parent 15021d364d
commit 5c5c874114
1 changed files with 7 additions and 0 deletions
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7
drivers/iommu/ipmmu-vmsa.c
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@ -1108,12 +1108,19 @@ static struct platform_driver ipmmu_driver = {
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;