[PATCH v2 13/17] driver core: Use device's fwnode to check if it is waiting for suppliers

[Saravana Kannan]

To check if a device is still waiting for its supplier devices to be
added, we used to check if the devices is in a global
waiting_for_suppliers list. Since the global list will be deleted in
subsequent patches, this patch stops using this check.

Instead, this patch uses a more device specific check. It checks if the
device's fwnode has any fwnode links that haven't been converted to
device links yet.

Signed-off-by: Saravana Kannan <sarava...@google.com>
---
 drivers/base/core.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 395dece1c83a..1873cecb0cc4 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -51,6 +51,7 @@ static DEFINE_MUTEX(wfs_lock);
 static LIST_HEAD(deferred_sync);
 static unsigned int defer_sync_state_count = 1;
 static DEFINE_MUTEX(fwnode_link_lock);
+static bool fw_devlink_is_permissive(void);
 
 /**
  * fwnode_link_add - Create a link between two fwnode_handles.
@@ -995,13 +996,13 @@ int device_links_check_suppliers(struct device *dev)
         * Device waiting for supplier to become available is not allowed to
         * probe.
         */
-       mutex_lock(&wfs_lock);
-       if (!list_empty(&dev->links.needs_suppliers) &&
-           dev->links.need_for_probe) {
-               mutex_unlock(&wfs_lock);
+       mutex_lock(&fwnode_link_lock);
+       if (dev->fwnode && !list_empty(&dev->fwnode->suppliers) &&
+           !fw_devlink_is_permissive()) {
+               mutex_unlock(&fwnode_link_lock);
                return -EPROBE_DEFER;
        }
-       mutex_unlock(&wfs_lock);
+       mutex_unlock(&fwnode_link_lock);
 
        device_links_write_lock();
 
@@ -1167,10 +1168,7 @@ static ssize_t waiting_for_supplier_show(struct device 
*dev,
        bool val;
 
        device_lock(dev);
-       mutex_lock(&wfs_lock);
-       val = !list_empty(&dev->links.needs_suppliers)
-             && dev->links.need_for_probe;
-       mutex_unlock(&wfs_lock);
+       val = !list_empty(&dev->fwnode->suppliers);
        device_unlock(dev);
        return sysfs_emit(buf, "%u\n", val);
 }
@@ -2202,7 +2200,7 @@ static int device_add_attrs(struct device *dev)
                        goto err_remove_dev_groups;
        }
 
-       if (fw_devlink_flags && !fw_devlink_is_permissive()) {
+       if (fw_devlink_flags && !fw_devlink_is_permissive() && dev->fwnode) {
                error = device_create_file(dev, &dev_attr_waiting_for_supplier);
                if (error)
                        goto err_remove_dev_online;
-- 
2.29.2.454.gaff20da3a2-goog