[PATCH 6.18 329/752] fpga: of-fpga-region: Fail if any bridge is missing

Sasha Levin
2026-02-28T17:52:44Z

From: Romain Gantois <romain.gantois@bootlin.com>

[ Upstream commit c141c8221bc5089de915d9f26044df892c343c7e ]

When parsing the region bridge list from the "fpga-bridges" device tree
property, the of-fpga-region driver will silently ignore bridges which fail
to be obtained, for example due to a missing bridge driver or invalid
phandle.

This can lead to hardware issues if a region bridge stays coupled when
partial programming is performed.

Fail if any of the bridges specified in "fpga-bridges" cannot be obtained.

Signed-off-by: Romain Gantois <romain.gantois@bootlin.com>
Link: https://lore.kernel.org/r/20251127-of-fpga-region-fail-if-bridges-not-found-v1-1-ca674f8d07eb@bootlin.com
Reviewed-by: Xu Yilun <yilun.xu@intel.com>
Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/fpga/of-fpga-region.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c
index 43db4bb77138a..caa091224dc54 100644
--- a/drivers/fpga/of-fpga-region.c
+++ b/drivers/fpga/of-fpga-region.c
@@ -83,7 +83,7 @@ static struct fpga_manager *of_fpga_region_get_mgr(struct device_node *np)
* done with the bridges.
*
* Return: 0 for success (even if there are no bridges specified)
- * or -EBUSY if any of the bridges are in use.
+ * or an error code if any of the bridges are not available.
*/
static int of_fpga_region_get_bridges(struct fpga_region *region)
{
@@ -130,10 +130,10 @@ static int of_fpga_region_get_bridges(struct fpga_region *region)
&region->bridge_list);
of_node_put(br);

- /* If any of the bridges are in use, give up */
- if (ret == -EBUSY) {
+ /* If any of the bridges are not available, give up */
+ if (ret) {
fpga_bridges_put(&region->bridge_list);
- return -EBUSY;
+ return ret;
}
}

--
2.51.0