diff options
| author | Thierry Reding <treding@nvidia.com> | 2014-11-07 15:26:18 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2014-11-14 14:41:39 +0000 |
| commit | 0e7d37adbe45404a76d05d4ef11544f23cf639dd (patch) | |
| tree | 0081582c0738c99ed7f073a967751bdf126887ee /drivers/iommu | |
| parent | cfdeec22e459e3c5081c8fc6d956c8ee68943397 (diff) | |
| download | linux-0e7d37adbe45404a76d05d4ef11544f23cf639dd.tar.bz2 | |
iommu/arm-smmu: Play nice on non-ARM/SMMU systems
Currently the driver registers IOMMU bus operations for all busses even
if no ARM SMMU is present on a system. Depending on the driver probing
order this prevents the driver for the real IOMMU to register itself as
the bus-wide IOMMU.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/arm-smmu.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index c8fc02f111c5..217581469f79 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -2075,8 +2075,20 @@ static struct platform_driver arm_smmu_driver = { static int __init arm_smmu_init(void) { + struct device_node *np; int ret; + /* + * Play nice with systems that don't have an ARM SMMU by checking that + * an ARM SMMU exists in the system before proceeding with the driver + * and IOMMU bus operation registration. + */ + np = of_find_matching_node(NULL, arm_smmu_of_match); + if (!np) + return 0; + + of_node_put(np); + ret = platform_driver_register(&arm_smmu_driver); if (ret) return ret; |