Le 19/01/2023 à 10:53, Michal Suchanek a écrit :
> The commit 2d681d6a23a1 ("of: Make of framebuffer devices unique")
> breaks build because of wrong argument to snprintf. That certainly
> avoids the runtime error but is not the intended outcome.
>
> Also use standard device name format of-display.N for all created
> devices.
>
> Fixes: 2d681d6a23a1 ("of: Make of framebuffer devices unique")
> Signed-off-by: Michal Suchanek <msucha...@suse.de>
> ---
> v2: Update the device name format
> ---
> drivers/of/platform.c | 12 ++++++++----
> 1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/of/platform.c b/drivers/of/platform.c
> index f2a5d679a324..8c1b1de22036 100644
> --- a/drivers/of/platform.c
> +++ b/drivers/of/platform.c
> @@ -525,7 +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 = 1;
> + int display_number = 0;
> + char buf[14];
Can you declare that in the for block where it is used instead ?
> + char *of_display_format = "of-display.%d";
Should be const ?
> int ret;
>
> /* Check if we have a MacOS display without a node spec */
> @@ -556,7 +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))
> + continue;
Can you make buf big enough to avoid that ?
And by the way could it be called something else than 'buf' ?
See exemple here :
https://elixir.bootlin.com/linux/v6.1/source/drivers/fsi/fsi-occ.c#L690
> + dev = of_platform_device_create(node, buf, NULL);
> if (WARN_ON(!dev))
> return -ENOMEM;
> boot_display = node;
> @@ -564,10 +569,9 @@ static int __init of_platform_default_populate_init(void)
> }
>
> for_each_node_by_type(node, "display") {
> - char *buf[14];
> if (!of_get_property(node, "linux,opened", NULL) ||
> node == boot_display)
> continue;
> - ret = snprintf(buf, "of-display-%d", display_number++);
> + ret = snprintf(buf, sizeof(buf), of_display_format,
> display_number++);
> if (ret >= sizeof(buf))
> continue;
> of_platform_device_create(node, buf, NULL);
