Re: [PATCH 07/10] acpi: Do not return struct iommu_ops from acpi_iommu_configure_id()

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On Tue, Nov 28, 2023 at 08:48:03PM -0400, Jason Gunthorpe wrote:
Nothing needs this pointer. Return a normal error code with the usual
IOMMU semantic that ENODEV means 'there is no IOMMU driver'.

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Reviewed-by: Jerry Snitselaar <jsnitsel@xxxxxxxxxx>
Tested-by: Hector Martin <marcan@xxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
---
  drivers/acpi/scan.c | 29 +++++++++++++++++------------
  1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 444a0b3c72f2d8..340ba720c72129 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1562,8 +1562,7 @@ 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;
@@ -1577,7 +1576,7 @@ static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
  	ops = acpi_iommu_fwspec_ops(dev);
  	if (ops) {
  		mutex_unlock(&iommu_probe_device_lock);
-		return ops;
+		return 0;
  	}

  	err = iort_iommu_configure_id(dev, id_in);
@@ -1594,12 +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 */
@@ -1611,10 +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 */
@@ -1628,7 +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);
@@ -1637,10 +1637,15 @@ 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;

+	/*
+	 * 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;
--
2.42.0


Reviewed-by: Moritz Fischer <moritzf@xxxxxxxxxx>

Cheers,
Moritz




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