[PATCH v2 07/11] driver core: fw_devlink: Consolidate device link flag computation

Saravana Kannan
2023-01-27T00:12:48Z

Consolidate the code that computes the flags to be used when creating a
device link from a fwnode link.

Fixes: 2de9d8e0d2fe ("driver core: fw_devlink: Improve handling of cyclic dependencies")
Signed-off-by: Saravana Kannan <saravanak@google.com>
---
drivers/base/core.c | 28 +++++++++++++++-------------
include/linux/fwnode.h | 1 -
2 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 82b29e9070bf..b61d5d86a600 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1726,8 +1726,11 @@ static int __init fw_devlink_strict_setup(char *arg)
}
early_param("fw_devlink.strict", fw_devlink_strict_setup);

-u32 fw_devlink_get_flags(void)
+static inline u32 fw_devlink_get_flags(u8 fwlink_flags)
{
+ if (fwlink_flags & FWLINK_FLAG_CYCLE)
+ return FW_DEVLINK_FLAGS_PERMISSIVE | DL_FLAG_CYCLE;
+
return fw_devlink_flags;
}

@@ -1937,7 +1940,7 @@ static bool fwnode_ancestor_init_without_drv(struct fwnode_handle *fwnode)
* fw_devlink_create_devlink - Create a device link from a consumer to fwnode
* @con: consumer device for the device link
* @sup_handle: fwnode handle of supplier
- * @flags: devlink flags
+ * @link: fwnode link that's being converted to a device link
*
* This function will try to create a device link between the consumer device
* @con and the supplier device represented by @sup_handle.
@@ -1954,10 +1957,17 @@ static bool fwnode_ancestor_init_without_drv(struct fwnode_handle *fwnode)
* possible to do that in the future
*/
static int fw_devlink_create_devlink(struct device *con,
- struct fwnode_handle *sup_handle, u32 flags)
+ struct fwnode_handle *sup_handle,
+ struct fwnode_link *link)
{
struct device *sup_dev;
int ret = 0;
+ u32 flags;
+
+ if (con->fwnode == link->consumer)
+ flags = fw_devlink_get_flags(link->flags);
+ else
+ flags = FW_DEVLINK_FLAGS_PERMISSIVE;

/*
* In some cases, a device P might also be a supplier to its child node
@@ -2090,7 +2100,6 @@ static void __fw_devlink_link_to_consumers(struct device *dev)
struct fwnode_link *link, *tmp;

list_for_each_entry_safe(link, tmp, &fwnode->consumers, s_hook) {
- u32 dl_flags = fw_devlink_get_flags();
struct device *con_dev;
bool own_link = true;
int ret;
@@ -2120,14 +2129,13 @@ static void __fw_devlink_link_to_consumers(struct device *dev)
con_dev = NULL;
} else {
own_link = false;
- dl_flags = FW_DEVLINK_FLAGS_PERMISSIVE;
}
}

if (!con_dev)
continue;

- ret = fw_devlink_create_devlink(con_dev, fwnode, dl_flags);
+ ret = fw_devlink_create_devlink(con_dev, fwnode, link);
put_device(con_dev);
if (!own_link || ret == -EAGAIN)
continue;
@@ -2168,19 +2176,13 @@ static void __fw_devlink_link_to_suppliers(struct device *dev,
bool own_link = (dev->fwnode == fwnode);
struct fwnode_link *link, *tmp;
struct fwnode_handle *child = NULL;
- u32 dl_flags;
-
- if (own_link)
- dl_flags = fw_devlink_get_flags();
- else
- dl_flags = FW_DEVLINK_FLAGS_PERMISSIVE;

list_for_each_entry_safe(link, tmp, &fwnode->suppliers, c_hook) {
int ret;
struct device *sup_dev;
struct fwnode_handle *sup = link->supplier;

- ret = fw_devlink_create_devlink(dev, sup, dl_flags);
+ ret = fw_devlink_create_devlink(dev, sup, link);
if (!own_link || ret == -EAGAIN)
continue;

diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index fdf2ee0285b7..5700451b300f 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -207,7 +207,6 @@ static inline void fwnode_dev_initialized(struct fwnode_handle *fwnode,
fwnode->flags &= ~FWNODE_FLAG_INITIALIZED;
}

-extern u32 fw_devlink_get_flags(void);
extern bool fw_devlink_is_strict(void);
int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup);
void fwnode_links_purge(struct fwnode_handle *fwnode);
--
2.39.1.456.gfc5497dd1b-goog