The __find_rmem() function is the only place that references the phandle
field of the reserved_mem struct. __find_rmem() is used to match a
device_node object to its corresponding entry in the reserved_mem array
using its phandle value. But, there is already a function called
of_reserved_mem_lookup() which carries out the same action using the
name of the node.
Using the of_reserved_mem_lookup() function is more reliable because
every node is guaranteed to have a name, but not all nodes will have a
phandle.
Nodes are only assigned a phandle if they are explicitly defined in the
DT using "phandle = <phandle_number>", or if they are referenced by
another node in the DT. Hence, If the phandle field is empty, then
__find_rmem() will return a false negative.
Hence, delete the __find_rmem() function and switch to using the
of_reserved_mem_lookup() function to find the corresponding entry of a
device_node in the reserved_mem array. Since the phandle field of the
reserved_mem struct is now unused, delete that as well.
Signed-off-by: Oreoluwa Babatunde <[email protected]>
---
v2:
- Addressed error found by kernel test bot:
https://lore.kernel.org/all/[email protected]/
- Fixed spelling error in commit text.
v1:
https://lore.kernel.org/all/[email protected]/
drivers/of/of_reserved_mem.c | 22 +---------------------
include/linux/of_reserved_mem.h | 1 -
2 files changed, 1 insertion(+), 22 deletions(-)
diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 8236ecae2953..46e1c3fbc769 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -437,17 +437,10 @@ void __init fdt_init_reserved_mem(void)
for (i = 0; i < reserved_mem_count; i++) {
struct reserved_mem *rmem = &reserved_mem[i];
unsigned long node = rmem->fdt_node;
- int len;
- const __be32 *prop;
int err = 0;
bool nomap;
nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
- prop = of_get_flat_dt_prop(node, "phandle", &len);
- if (!prop)
- prop = of_get_flat_dt_prop(node, "linux,phandle", &len);
- if (prop)
- rmem->phandle = of_read_number(prop, len/4);
if (rmem->size == 0)
err = __reserved_mem_alloc_size(node, rmem->name,
@@ -477,19 +470,6 @@ void __init fdt_init_reserved_mem(void)
}
}
-static inline struct reserved_mem *__find_rmem(struct device_node *node)
-{
- unsigned int i;
-
- if (!node->phandle)
- return NULL;
-
- for (i = 0; i < reserved_mem_count; i++)
- if (reserved_mem[i].phandle == node->phandle)
- return &reserved_mem[i];
- return NULL;
-}
-
struct rmem_assigned_device {
struct device *dev;
struct reserved_mem *rmem;
@@ -534,7 +514,7 @@ int of_reserved_mem_device_init_by_idx(struct device *dev,
return 0;
}
- rmem = __find_rmem(target);
+ rmem = of_reserved_mem_lookup(target);
of_node_put(target);
if (!rmem || !rmem->ops || !rmem->ops->device_init)
diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h
index 4de2a24cadc9..e338282da652 100644
--- a/include/linux/of_reserved_mem.h
+++ b/include/linux/of_reserved_mem.h
@@ -11,7 +11,6 @@ struct reserved_mem_ops;
struct reserved_mem {
const char *name;
unsigned long fdt_node;
- unsigned long phandle;
const struct reserved_mem_ops *ops;
phys_addr_t base;
phys_addr_t size;
--
2.34.1
On Thu, May 2, 2024 at 2:24 PM Oreoluwa Babatunde
<[email protected]> wrote:
>
> The __find_rmem() function is the only place that references the phandle
> field of the reserved_mem struct. __find_rmem() is used to match a
> device_node object to its corresponding entry in the reserved_mem array
> using its phandle value. But, there is already a function called
> of_reserved_mem_lookup() which carries out the same action using the
> name of the node.
>
> Using the of_reserved_mem_lookup() function is more reliable because
> every node is guaranteed to have a name, but not all nodes will have a
> phandle.
>
> Nodes are only assigned a phandle if they are explicitly defined in the
> DT using "phandle = <phandle_number>", or if they are referenced by
> another node in the DT. Hence, If the phandle field is empty, then
> __find_rmem() will return a false negative.
>
> Hence, delete the __find_rmem() function and switch to using the
> of_reserved_mem_lookup() function to find the corresponding entry of a
> device_node in the reserved_mem array. Since the phandle field of the
> reserved_mem struct is now unused, delete that as well.
>
> Signed-off-by: Oreoluwa Babatunde <[email protected]>
> ---
> v2:
> - Addressed error found by kernel test bot:
> https://lore.kernel.org/all/[email protected]/
> - Fixed spelling error in commit text.
>
> v1:
> https://lore.kernel.org/all/[email protected]/
>
> drivers/of/of_reserved_mem.c | 22 +---------------------
> include/linux/of_reserved_mem.h | 1 -
> 2 files changed, 1 insertion(+), 22 deletions(-)
Applied, thanks.