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 non-boot
disaplay.
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.
Suggested-by: Thomas Zimmermann
Signed-off-by: Michal Suchanek
---
v3:
- merge fix into original patch
- Update the device name format
- add missing const
- do not continue with iterating display devices when formatting device
name fails
---
drivers/of/platform.c | 13 +++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 81c8c227ab6b..4d3a4d9f79f2 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -525,6 +525,9 @@ 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;
+ char buf[14];
+ const char *of_display_format = "of-display.%d";
int ret;
/* Check if we have a MacOS display without a node spec */
@@ -555,7 +558,10 @@ 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);
+ ret = snprintf(buf, sizeof(buf), of_display_format,
display_number++);
+ if (ret >= sizeof(buf))
+ return -EOVERFLOW;
+ dev = of_platform_device_create(node, buf, NULL);
if (WARN_ON(!dev))
return -ENOMEM;
boot_display = node;
@@ -564,7 +570,10 @@ static int __init of_platform_default_populate_init(void)
for_each_node_by_type(node, "display") {
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))
+ break;
+ of_platform_device_create(node, buf, NULL);
}
} else {
--
2.35.3
