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>

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 42a67245643234a8fb23614feb1d7a5f60f7c0c9..79863354c801692045be3a834c049ae107fb98a5 100644 (file)
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -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);
 }