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SubjectRe: [PATCH] of: Make of framebuffer devices unique
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Hi Michal,

thanks for fixing this issue. But the review time was way too short.
Please see my comments below.

Am 18.01.23 um 22:46 schrieb Michal Suchánek:
> On Wed, Jan 18, 2023 at 09:13:05PM +0100, Erhard F. wrote:
>> On Tue, 17 Jan 2023 17:58:04 +0100
>> Michal Suchanek <msuchanek@suse.de> wrote:
>>
>>> 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. <erhard_f@mailbox.org>
>>> Suggested-by: Thomas Zimmermann <tzimmermann@suse.de>
>>> Signed-off-by: Michal Suchanek <msuchanek@suse.de>
>>> ---
>>> drivers/of/platform.c | 8 +++++++-
>>> 1 file changed, 7 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/of/platform.c b/drivers/of/platform.c
>>> index 81c8c227ab6b..f2a5d679a324 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 = 1;
>>> int ret;
>>>
>>> /* Check if we have a MacOS display without a node spec */
>>> @@ -561,10 +562,15 @@ static int __init of_platform_default_populate_init(void)
>>> boot_display = node;
>>> break;
>>> }
>>> +
>>> for_each_node_by_type(node, "display") {
>>> + char *buf[14];
>>> if (!of_get_property(node, "linux,opened", NULL) || node == boot_display)
>>> continue;
>>> - of_platform_device_create(node, "of-display", NULL);
>>> + ret = snprintf(buf, "of-display-%d", display_number++);

Platform devices use a single dot (.) as separator before the index.
Counting starts at zero. See /sys/bus/platform/ for examples. Can we
please stick with that scheme? Generated names would then be
of-display.0, of-display.1, etc.

Best regards
Thomas



>>> + if (ret >= sizeof(buf))
>>> + continue;
>>> + of_platform_device_create(node, buf, NULL);
>>> }
>>>
>>> } else {
>>> --
>>> 2.35.3
>>>
>>
>> Thank you for the patch Michal!
>>
>> It applies on 6.2-rc4 but I get this build error with my config:
>
> Indeed, it's doubly bad.
>
> Where is the kernel test robot when you need it?
>
> It should not be that easy to miss this file but clearly it can happen.
>
> I will send a fixup.
>
> Sorry about the mess.
>
> Thanks
>
> Michal

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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