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-rw-r--r--include/linux/iommu.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index d084e8777e0e..ddad0ae0a433 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -98,11 +98,15 @@ extern void iommu_set_fault_handler(struct iommu_domain *domain,
* Returns 0 on success and an appropriate error code otherwise (if dynamic
* PTE/TLB loading will one day be supported, implementations will be able
* to tell whether it succeeded or not according to this return value).
+ *
+ * Specifically, -ENOSYS is returned if a fault handler isn't installed
+ * (though fault handlers can also return -ENOSYS, in case they want to
+ * elicit the default behavior of the IOMMU drivers).
*/
static inline int report_iommu_fault(struct iommu_domain *domain,
struct device *dev, unsigned long iova, int flags)
{
- int ret = 0;
+ int ret = -ENOSYS;
/*
* if upper layers showed interest and installed a fault handler,