Re: [PATCH 03/10] iommu/of: Use -ENODEV consistently in of_iommu_configure()

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On Tue, Nov 28, 2023 at 08:47:59PM -0400, Jason Gunthorpe wrote:
Instead of returning 1 and trying to handle positive error codes just
stick to the convention of returning -ENODEV. Remove references to ops
from of_iommu_configure(), a NULL ops will already generate an error code.

There is no reason to check dev->bus, if err=0 at this point then the
called configure functions thought there was an iommu and we should try to
probe it. Remove it.

Reviewed-by: Jerry Snitselaar <jsnitsel@xxxxxxxxxx>
Tested-by: Hector Martin <marcan@xxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
---
  drivers/iommu/of_iommu.c | 49 ++++++++++++----------------------------
  1 file changed, 15 insertions(+), 34 deletions(-)

diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index c6510d7e7b241b..164317bfb8a81f 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -17,8 +17,6 @@
  #include <linux/slab.h>
  #include <linux/fsl/mc.h>

-#define NO_IOMMU	1
-
  static int of_iommu_xlate(struct device *dev,
  			  struct of_phandle_args *iommu_spec)
  {
@@ -29,7 +27,7 @@ static int of_iommu_xlate(struct device *dev,
  	ops = iommu_ops_from_fwnode(fwnode);
  	if ((ops && !ops->of_xlate) ||
  	    !of_device_is_available(iommu_spec->np))
-		return NO_IOMMU;
+		return -ENODEV;

  	ret = iommu_fwspec_init(dev, &iommu_spec->np->fwnode, ops);
  	if (ret)
@@ -61,7 +59,7 @@ static int of_iommu_configure_dev_id(struct device_node *master_np,
  			 "iommu-map-mask", &iommu_spec.np,
  			 iommu_spec.args);
  	if (err)
-		return err == -ENODEV ? NO_IOMMU : err;
+		return err;

  	err = of_iommu_xlate(dev, &iommu_spec);
  	of_node_put(iommu_spec.np);
@@ -72,7 +70,7 @@ static int of_iommu_configure_dev(struct device_node *master_np,
  				  struct device *dev)
  {
  	struct of_phandle_args iommu_spec;
-	int err = NO_IOMMU, idx = 0;
+	int err = -ENODEV, idx = 0;

  	while (!of_parse_phandle_with_args(master_np, "iommus",
  					   "#iommu-cells",
@@ -117,9 +115,8 @@ static int of_iommu_configure_device(struct device_node *master_np,
  int of_iommu_configure(struct device *dev, struct device_node *master_np,
  		       const u32 *id)
  {
-	const struct iommu_ops *ops = NULL;
  	struct iommu_fwspec *fwspec;
-	int err = NO_IOMMU;
+	int err;

  	if (!master_np)
  		return -ENODEV;
@@ -153,37 +150,21 @@ int of_iommu_configure(struct device *dev, struct device_node *master_np,
  	} else {
  		err = of_iommu_configure_device(master_np, dev, id);
  	}
-
-	/*
-	 * Two success conditions can be represented by non-negative err here:
-	 * >0 : there is no IOMMU, or one was unavailable for non-fatal reasons
-	 *  0 : we found an IOMMU, and dev->fwspec is initialised appropriately
-	 * <0 : any actual error
-	 */
-	if (!err) {
-		/* The fwspec pointer changed, read it again */
-		fwspec = dev_iommu_fwspec_get(dev);
-		ops    = fwspec->ops;
-	}
  	mutex_unlock(&iommu_probe_device_lock);

-	/*
-	 * If we have reason to believe the IOMMU driver missed the initial
-	 * probe for dev, replay it to get things in order.
-	 */
-	if (!err && dev->bus)
-		err = iommu_probe_device(dev);
-
-	/* Ignore all other errors apart from EPROBE_DEFER */
-	if (err < 0) {
-		if (err == -EPROBE_DEFER)
-			return err;
-		dev_dbg(dev, "Adding to IOMMU failed: %pe\n", ERR_PTR(err));
+	if (err == -ENODEV || err == -EPROBE_DEFER)
  		return err;
-	}
-	if (!ops)
-		return -ENODEV;
+	if (err)
+		goto err_log;
+
+	err = iommu_probe_device(dev);
+	if (err)
+		goto err_log;
  	return 0;
+
+err_log:
+	dev_dbg(dev, "Adding to IOMMU failed: %pe\n", ERR_PTR(err));
+	return err;
  }

  static enum iommu_resv_type __maybe_unused
--
2.42.0


Reviewed-by: Moritz Fischer <moritzf@xxxxxxxxxx>



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