This is a note to let you know that I've just added the patch titled
driver core: Add FWLINK_FLAG_IGNORE to completely ignore a fwnode link
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
driver-core-add-fwlink_flag_ignore-to-completely-ign.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 04376b4e41eddbdc05a4b2b617aae9e80ec3448b
Author: Saravana Kannan <saravanak@xxxxxxxxxx>
Date: Mon Mar 4 21:04:55 2024 -0800
driver core: Add FWLINK_FLAG_IGNORE to completely ignore a fwnode link
[ Upstream commit b7e1241d8f77ed64404a5e4450f43a319310fc91 ]
A fwnode link between specific supplier-consumer fwnodes can be added
multiple times for multiple reasons. If that dependency doesn't exist,
deleting the fwnode link once doesn't guarantee that it won't get created
again.
So, add FWLINK_FLAG_IGNORE flag to mark a fwnode link as one that needs to
be completely ignored. Since a fwnode link's flags is an OR of all the
flags passed to all the fwnode_link_add() calls to create that specific
fwnode link, the FWLINK_FLAG_IGNORE flag is preserved and can be used to
mark a fwnode link as on that need to be completely ignored until it is
deleted.
Signed-off-by: Saravana Kannan <saravanak@xxxxxxxxxx>
Acked-by: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240305050458.1400667-3-saravanak@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Stable-dep-of: bac3b10b78e5 ("driver core: fw_devlink: Stop trying to optimize cycle detection logic")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 499904f1ba6b3..3aaf234dbb088 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1025,7 +1025,8 @@ static struct fwnode_handle *fwnode_links_check_suppliers(
return NULL;
list_for_each_entry(link, &fwnode->suppliers, c_hook)
- if (!(link->flags & FWLINK_FLAG_CYCLE))
+ if (!(link->flags &
+ (FWLINK_FLAG_CYCLE | FWLINK_FLAG_IGNORE)))
return link->supplier;
return NULL;
@@ -1976,6 +1977,9 @@ static bool __fw_devlink_relax_cycles(struct device *con,
}
list_for_each_entry(link, &sup_handle->suppliers, c_hook) {
+ if (link->flags & FWLINK_FLAG_IGNORE)
+ continue;
+
if (__fw_devlink_relax_cycles(con, link->supplier)) {
__fwnode_link_cycle(link);
ret = true;
@@ -2054,6 +2058,9 @@ static int fw_devlink_create_devlink(struct device *con,
int ret = 0;
u32 flags;
+ if (link->flags & FWLINK_FLAG_IGNORE)
+ return 0;
+
if (con->fwnode == link->consumer)
flags = fw_devlink_get_flags(link->flags);
else
diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index 5700451b300fb..525cc031596b6 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -51,8 +51,10 @@ struct fwnode_handle {
* fwnode link flags
*
* CYCLE: The fwnode link is part of a cycle. Don't defer probe.
+ * IGNORE: Completely ignore this link, even during cycle detection.
*/
#define FWLINK_FLAG_CYCLE BIT(0)
+#define FWLINK_FLAG_IGNORE BIT(1)
struct fwnode_link {
struct fwnode_handle *supplier;
