Commit 68223eee authored by Saravana Kannan's avatar Saravana Kannan Committed by Greg Kroah-Hartman
Browse files

driver core: Set deferred probe reason when deferred by driver core 



When the driver core defers the probe of a device, set the deferred
probe reason so that it's easier to debug. The deferred probe reason is
available in debugfs under devices_deferred.

Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarSaravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20210915172808.620546-2-saravanak@google.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 04f41c68

drivers/base/core.c

+9 −6
Original line number Diff line number Diff line
@@ -975,6 +975,7 @@ int device_links_check_suppliers(struct device *dev) 
{

	struct device_link *link;

	int ret = 0;

	struct fwnode_handle *sup_fw;



	/*

	 * Device waiting for supplier to become available is not allowed to
@@ -983,10 +984,11 @@ int device_links_check_suppliers(struct device *dev) 
	mutex_lock(&fwnode_link_lock);

	if (dev->fwnode && !list_empty(&dev->fwnode->suppliers) &&

	    !fw_devlink_is_permissive()) {

		dev_dbg(dev, "probe deferral - wait for supplier %pfwP\n",

			list_first_entry(&dev->fwnode->suppliers,

		sup_fw = list_first_entry(&dev->fwnode->suppliers,

					  struct fwnode_link,

			c_hook)->supplier);

					  c_hook)->supplier;

		dev_err_probe(dev, -EPROBE_DEFER, "wait for supplier %pfwP\n",

			      sup_fw);

		mutex_unlock(&fwnode_link_lock);

		return -EPROBE_DEFER;

	}
@@ -1001,7 +1003,8 @@ int device_links_check_suppliers(struct device *dev) 
		if (link->status != DL_STATE_AVAILABLE &&

		    !(link->flags & DL_FLAG_SYNC_STATE_ONLY)) {

			device_links_missing_supplier(dev);

			dev_dbg(dev, "probe deferral - supplier %s not ready\n",

			dev_err_probe(dev, -EPROBE_DEFER,

				      "supplier %s not ready\n",

				      dev_name(link->supplier));

			ret = -EPROBE_DEFER;

			break;