Re: [PATCH] sparc: add missing put_device()

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On 18/07/2023 10:19, sunran001@xxxxxxxxxx wrote:
The of_find_device_by_node() takes a reference to the underlying device
structure, we should release that reference.

Detected by coccinelle with the following ERRORS:
./arch/sparc/kernel/of_device_common.c:23:1-7: ERROR: missing
put_device; call of_find_device_by_node on line 18, but without a
corresponding object release within this function.
./arch/sparc/kernel/of_device_common.c:36:1-7: ERROR: missing
put_device; call of_find_device_by_node on line 30, but without a
corresponding object release within this function.
./arch/sparc/kernel/of_device_common.c:50:1-7: ERROR: missing
put_device; call of_find_device_by_node on line 42, but without a
corresponding object release within this function.

Signed-off-by: Ran Sun <sunran001@xxxxxxxxxx>
---
  arch/sparc/kernel/of_device_common.c | 3 +++
  1 file changed, 3 insertions(+)

diff --git a/arch/sparc/kernel/of_device_common.c b/arch/sparc/kernel/of_device_common.c
index 60f86b837658..7851307de6d0 100644
--- a/arch/sparc/kernel/of_device_common.c
+++ b/arch/sparc/kernel/of_device_common.c
@@ -20,6 +20,7 @@ unsigned int irq_of_parse_and_map(struct device_node *node, int index)
      if (!op || index >= op->archdata.num_irqs)
          return 0;

+    put_device(op->dev);
      return op->archdata.irqs[index];

Device can be gone and freed after the put_device() call. So at least put_device() should come after the op->archdata access.

Same applies to all the cases below.

  }
  EXPORT_SYMBOL(irq_of_parse_and_map);
@@ -32,6 +33,7 @@ int of_address_to_resource(struct device_node *node, int index,
      if (!op || index >= op->num_resources)
          return -EINVAL;

+    put_device(op->dev);
      memcpy(r, &op->archdata.resource[index], sizeof(*r));
      return 0;
  }
@@ -45,6 +47,7 @@ void __iomem *of_iomap(struct device_node *node, int index)
      if (!op || index >= op->num_resources)
          return NULL;

+    put_device(op->dev);
      r = &op->archdata.resource[index];

      return of_ioremap(r, 0, resource_size(r), (char *) r->name);

--
With best wishes
Dmitry




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