Commit 3334f0da authored Feb 21, 2020 by Saravana Kannan

FROMGIT: driver core: Reevaluate dev->links.need_for_probe as suppliers are added



A previous patch 03324507e66c ("driver core: Allow
fwnode_operations.add_links to differentiate errors") forgot to update
all call sites to fwnode_operations.add_links. This patch fixes that.

Legend:
-> Denotes RHS is an optional/potential supplier for LHS
=> Denotes RHS is a mandatory supplier for LHS

Example:

Device A => Device X
Device A -> Device Y

Before this patch:
1. Device A is added.
2. Device A is marked as waiting for mandatory suppliers
3. Device X is added
4. Device A is left marked as waiting for mandatory suppliers

Step 4 is wrong since all mandatory suppliers of Device A have been
added.

After this patch:
1. Device A is added.
2. Device A is marked as waiting for mandatory suppliers
3. Device X is added
4. Device A is no longer considered as waiting for mandatory suppliers

This is the correct behavior.

Fixes: 03324507e66c ("driver core: Allow fwnode_operations.add_links to differentiate errors")
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20200222014038.180923-2-saravanak@google.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 1745d299af5b373abad08fa29bff0d31dc6aff21
https: //git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git driver-core-next)
Bug: 150980623
Change-Id: I15210d65db4660dd315a09ff18f4499768f24378

parent a27e0934

drivers/base/core.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -523,9 +523,13 @@ static void device_link_add_missing_supplier_links(void)

		mutex_lock(&wfs_lock);
		list_for_each_entry_safe(dev, tmp, &wait_for_suppliers,
		links.needs_suppliers)
		if (!fwnode_call_int_op(dev->fwnode, add_links, dev))
		links.needs_suppliers) {
		int ret = fwnode_call_int_op(dev->fwnode, add_links, dev);
		if (!ret)
		list_del_init(&dev->links.needs_suppliers);
		else if (ret != -ENODEV)
		dev->links.need_for_probe = false;
		}
		mutex_unlock(&wfs_lock);
		}