iommu: Prevent oops in iommu_get() and while arch_iommu is in use
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Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/4 | omap iommu: Check existence of arch_iommuarch/ | +3 | 0 replies | |
| 2/4 | omap iommu: Add module information to struct iommu_functionsarch/ | +1 | 0 replies | |
| 3/4 | omap2 iommu: Set module information in omap2_iommu_opsarch/ | +2 | 0 replies | |
| 4/4 | omap iommu: Prevent iommu implementations from being unloaded while in usearch/ | +29 | 0 replies |
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Cover letter [PATCH 0/4] iommu: Prevent oops in iommu_get() and while arch_iommu is in use
Hi,
[Resend: the patches were accidentally sent to linux-media instead. Apologies.]
This patchset is aimed to fix a problem in arch_iommu implementation references. When an actual arch_iommu implementation is not loaded while iommu_get() is being called results to a kernel oops, as well as removing an arch_iommu implementation which is in use.
This patchset fixes both issues.
The patchset assumes the arch_iommu is uninstalled at module unload time. Is this an acceptable requirement?
Serialisation of the access to arch_iommu is done using mutex called arch_iommu_mutex.
module_put() doesn't need to have the arch_iommu_mutex since when this gets called there won't be any users on the arch_iommu anyway.
Comments are welcome. :-)
Cheers,
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Sakari Ailus [email protected]