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.
Signed-off-by: Jason Gunthorpe <j...@nvidia.com>
---
drivers/iommu/of_iommu.c | 42 +++++++++++++---------------------------
1 file changed, 13 insertions(+), 29 deletions(-)
diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index e2fa29c16dd758..4f77495a2543ea 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -17,7 +17,7 @@
#include <linux/slab.h>
#include <linux/fsl/mc.h>
-#define NO_IOMMU 1
+#define NO_IOMMU -ENODEV
static int of_iommu_xlate(struct device *dev,
struct of_phandle_args *iommu_spec)
@@ -117,9 +117,8 @@ 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 = dev_iommu_fwspec_get(dev);
- int err = NO_IOMMU;
+ int err;
if (!master_np)
return -ENODEV;
@@ -150,34 +149,19 @@ int of_iommu_configure(struct device *dev, struct
device_node *master_np,
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;
- }
- /*
- * 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);
+ if (err == -ENODEV || err == -EPROBE_DEFER)
+ return err;
+ if (err)
+ goto err_log;
- /* Ignore all other errors apart from EPROBE_DEFER */
- if (err < 0) {
- if (err == -EPROBE_DEFER)
- return err;
- dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
- return -ENODEV;
- }
- if (!ops)
- return -ENODEV;
+ err = iommu_probe_device(dev);
+ if (err)
+ goto err_log;
return 0;
+
+err_log:
+ dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
+ return err;
}
static enum iommu_resv_type __maybe_unused
--
2.42.0
