[PATCH v4] of: Make OF framebuffer device names unique
From: Rob Herring <robh@kernel.org>
Date: 2023-02-01 16:23:10
Also in:
linux-devicetree, lkml
Subsystem:
open firmware and flattened device tree, the rest · Maintainers:
Rob Herring, Saravana Kannan, Linus Torvalds
From: Michal Suchanek <redacted> Since Linux 5.19 this error is observed: sysfs: cannot create duplicate filename '/devices/platform/of-display' This is because multiple devices with the same name 'of-display' are created on the same bus. Update the code to create numbered device names for the displays. Also, fix a node refcounting issue when exiting the boot display loop. cc: linuxppc-dev@lists.ozlabs.org References: https://bugzilla.kernel.org/show_bug.cgi?id=216095 Fixes: 52b1b46c39ae ("of: Create platform devices for OF framebuffers") Reported-by: Erhard F. <redacted> Suggested-by: Thomas Zimmermann <tzimmermann@suse.de> Signed-off-by: Michal Suchanek <redacted> Link: https://lore.kernel.org/r/20230120180958.30798-1-msuchanek@suse.de (local) [robh: Rework to avoid node refcount leaks] Signed-off-by: Rob Herring <robh@kernel.org> --- drivers/of/platform.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 81c8c227ab6b..b3878a98d27f 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c@@ -525,6 +525,7 @@ static int __init of_platform_default_populate_init(void) if (IS_ENABLED(CONFIG_PPC)) { struct device_node *boot_display = NULL; struct platform_device *dev; + int display_number = 0; int ret; /* Check if we have a MacOS display without a node spec */
@@ -555,16 +556,23 @@ static int __init of_platform_default_populate_init(void) if (!of_get_property(node, "linux,opened", NULL) || !of_get_property(node, "linux,boot-display", NULL)) continue; - dev = of_platform_device_create(node, "of-display", NULL); + dev = of_platform_device_create(node, "of-display.0", NULL); + of_node_put(node); if (WARN_ON(!dev)) return -ENOMEM; boot_display = node; + display_number++; break; } for_each_node_by_type(node, "display") { + char buf[14]; + const char *of_display_format = "of-display.%d"; + if (!of_get_property(node, "linux,opened", NULL) || node == boot_display) continue; - of_platform_device_create(node, "of-display", NULL); + ret = snprintf(buf, sizeof(buf), of_display_format, display_number++); + if (ret < sizeof(buf)) + of_platform_device_create(node, buf, NULL); } } else {
--
2.39.0