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| author | Joerg Roedel <jroedel@suse.de> | 2020-04-29 15:36:51 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2020-05-05 14:36:13 +0200 |
| commit | 5012c3968537e2ffecbdb2eba3479bf9fb9e5597 (patch) | |
| tree | 6151549496e466e68bed8a68f3e59ccc7587cad1 /drivers/iommu/iommu.c | |
| parent | ce574c27ae275bc51b6437883fc9cd1c46b498e5 (diff) | |
| download | lwn-5012c3968537e2ffecbdb2eba3479bf9fb9e5597.tar.gz lwn-5012c3968537e2ffecbdb2eba3479bf9fb9e5597.zip | |
iommu: Export bus_iommu_probe() and make is safe for re-probing
Add a check to the bus_iommu_probe() call-path to make sure it ignores
devices which have already been successfully probed. Then export the
bus_iommu_probe() function so it can be used by IOMMU drivers.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20200429133712.31431-14-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/iommu.c')
| -rw-r--r-- | drivers/iommu/iommu.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 834a45da0ed0..397fd4fd0c32 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1610,11 +1610,19 @@ static int probe_iommu_group(struct device *dev, void *data) { const struct iommu_ops *ops = dev->bus->iommu_ops; struct list_head *group_list = data; + struct iommu_group *group; int ret; if (!dev_iommu_get(dev)) return -ENOMEM; + /* Device is probed already if in a group */ + group = iommu_group_get(dev); + if (group) { + iommu_group_put(group); + return 0; + } + if (!try_module_get(ops->owner)) { ret = -EINVAL; goto err_free_dev_iommu; @@ -1783,7 +1791,7 @@ static int iommu_group_create_direct_mappings(struct iommu_group *group) iommu_do_create_direct_mappings); } -static int bus_iommu_probe(struct bus_type *bus) +int bus_iommu_probe(struct bus_type *bus) { const struct iommu_ops *ops = bus->iommu_ops; int ret; |