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UPSTREAM: driver core: Add FWLINK_FLAG_IGNORE to completely ignore a fwnode link

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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@google.com>
Acked-by: "Rafael J. Wysocki" <rafael@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20240305050458.1400667-3-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit b7e1241d8f77ed64404a5e4450f43a319310fc91)
Change-Id: If9cbc4adf796816a6c04de049d57d7a5d0858e27
Bug: 347344057
This commit is contained in:
Saravana Kannan
2024-03-04 21:04:55 -08:00
committed by Treehugger Robot
parent 0a05df9c8a
commit b865d3ed06
2 changed files with 10 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/base/core.c
View File

@@ -1083,7 +1083,8 @@ 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;
@@ -1973,6 +1974,9 @@ 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;
@@ -2046,6 +2050,9 @@ 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

2
include/linux/fwnode.h
View File

@@ -53,8 +53,10 @@ 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;