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of: Make OF framebuffer device names unique 

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: 52b1b46c39 ("of: Create platform devices for OF framebuffers")
Reported-by: Erhard F. <erhard_f@mailbox.org>
Suggested-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Link: https://lore.kernel.org/r/20230201162247.3575506-1-robh@kernel.org
[robh: Rework to avoid node refcount leaks]
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Michal Suchanek 2023-02-01 10:22:47 -06:00 committed by Rob Herring
parent 064e32dc5b
commit 241d2fb56a
1 changed files with 10 additions and 2 deletions
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12
drivers/of/platform.c
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@ -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 {