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| author | Heiko Stübner <heiko@sntech.de> | 2014-10-29 01:22:56 +0100 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2014-11-04 15:00:48 +0100 |
| commit | d7da6bdc322bb79c4326dff7c2727236a48c4be9 (patch) | |
| tree | 65411798415b8d124525ee4d51426b08f47fd028 /drivers/iommu | |
| parent | iommu: Do more input validation in iommu_map_sg() (diff) | |
| download | linux-d7da6bdc322bb79c4326dff7c2727236a48c4be9.tar.xz linux-d7da6bdc322bb79c4326dff7c2727236a48c4be9.zip | |
iommu: Improve error handling when setting bus iommu
When some part of bus_set_iommu fails it should undo any made changes
and not simply leave everything as is.
This includes unregistering the bus notifier in iommu_bus_init when
add_iommu_group fails and also setting the bus->iommu_ops back to NULL.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/iommu.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 08c53c5a046f..02e4313e937c 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -818,7 +818,15 @@ static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops) kfree(nb); return err; } - return bus_for_each_dev(bus, NULL, &cb, add_iommu_group); + + err = bus_for_each_dev(bus, NULL, &cb, add_iommu_group); + if (err) { + bus_unregister_notifier(bus, nb); + kfree(nb); + return err; + } + + return 0; } /** @@ -836,13 +844,19 @@ static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops) */ int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops) { + int err; + if (bus->iommu_ops != NULL) return -EBUSY; bus->iommu_ops = ops; /* Do IOMMU specific setup for this bus-type */ - return iommu_bus_init(bus, ops); + err = iommu_bus_init(bus, ops); + if (err) + bus->iommu_ops = NULL; + + return err; } EXPORT_SYMBOL_GPL(bus_set_iommu); |