Commit 25ac86c6 authored by Saravana Kannan's avatar Saravana Kannan Committed by Greg Kroah-Hartman
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driver core: Use device's fwnode to check if it is waiting for suppliers 



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: default avatarSaravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20201121020232.908850-14-saravanak@google.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c2c724c8

drivers/base/core.c

+8 −8
Original line number Diff line number Diff line
@@ -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();
@@ -1167,8 +1168,7 @@ static ssize_t waiting_for_supplier_show(struct device *dev, 
	bool val;



	device_lock(dev);

	val = !list_empty(&dev->links.needs_suppliers)

	      && dev->links.need_for_probe;

	val = !list_empty(&dev->fwnode->suppliers);

	device_unlock(dev);

	return sysfs_emit(buf, "%u\n", val);

}
@@ -2200,7 +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;

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