diff options
Diffstat (limited to 'drivers/acpi/scan.c')
| -rw-r--r-- | drivers/acpi/scan.c | 39 |
1 files changed, 24 insertions, 15 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index fa5dd71a80fa..340ba720c721 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1562,23 +1562,27 @@ static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev) return fwspec ? fwspec->ops : NULL; } -static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev, - const u32 *id_in) +static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in) { int err; const struct iommu_ops *ops; + /* Serialise to make dev->iommu stable under our potential fwspec */ + mutex_lock(&iommu_probe_device_lock); /* * If we already translated the fwspec there is nothing left to do, * return the iommu_ops. */ ops = acpi_iommu_fwspec_ops(dev); - if (ops) - return ops; + if (ops) { + mutex_unlock(&iommu_probe_device_lock); + return 0; + } err = iort_iommu_configure_id(dev, id_in); if (err && err != -EPROBE_DEFER) err = viot_iommu_configure(dev); + mutex_unlock(&iommu_probe_device_lock); /* * If we have reason to believe the IOMMU driver missed the initial @@ -1589,12 +1593,14 @@ static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev, /* Ignore all other errors apart from EPROBE_DEFER */ if (err == -EPROBE_DEFER) { - return ERR_PTR(err); + return err; } else if (err) { dev_dbg(dev, "Adding to IOMMU failed: %d\n", err); - return NULL; + return -ENODEV; } - return acpi_iommu_fwspec_ops(dev); + if (!acpi_iommu_fwspec_ops(dev)) + return -ENODEV; + return 0; } #else /* !CONFIG_IOMMU_API */ @@ -1606,10 +1612,9 @@ int acpi_iommu_fwspec_init(struct device *dev, u32 id, return -ENODEV; } -static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev, - const u32 *id_in) +static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in) { - return NULL; + return -ENODEV; } #endif /* !CONFIG_IOMMU_API */ @@ -1623,7 +1628,7 @@ static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev, int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, const u32 *input_id) { - const struct iommu_ops *iommu; + int ret; if (attr == DEV_DMA_NOT_SUPPORTED) { set_dma_ops(dev, &dma_dummy_ops); @@ -1632,12 +1637,16 @@ int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, acpi_arch_dma_setup(dev); - iommu = acpi_iommu_configure_id(dev, input_id); - if (PTR_ERR(iommu) == -EPROBE_DEFER) + ret = acpi_iommu_configure_id(dev, input_id); + if (ret == -EPROBE_DEFER) return -EPROBE_DEFER; - arch_setup_dma_ops(dev, 0, U64_MAX, - iommu, attr == DEV_DMA_COHERENT); + /* + * Historically this routine doesn't fail driver probing due to errors + * in acpi_iommu_configure_id() + */ + + arch_setup_dma_ops(dev, 0, U64_MAX, attr == DEV_DMA_COHERENT); return 0; } |