[PATCH 6.18 719/752] fbdev: Use device_create_with_groups() to fix sysfs groups registration race

Sasha Levin
2026-02-28T17:58:57Z

From: Hans de Goede <johannes.goede@oss.qualcomm.com>

[ Upstream commit 68eeb0871e986ae5462439dae881e3a27bcef85f ]

The fbdev sysfs attributes are registered after sending the uevent for
the device creation, leaving a race window where e.g. udev rules may
not be able to access the sysfs attributes because the registration is
not done yet.

Fix this by switching to device_create_with_groups(). This also results in
a nice cleanup. After switching to device_create_with_groups() all that
is left of fb_init_device() is setting the drvdata and that can be passed
to device_create[_with_groups]() too. After which fb_init_device() can
be completely removed.

Dropping fb_init_device() + fb_cleanup_device() in turn allows removing
fb_info.class_flag as they were the only user of this field.

Fixes: 5fc830d6aca1 ("fbdev: Register sysfs groups through device_add_group")
Cc: stable@vger.kernel.org
Cc: Shixiong Ou <oushixiong@kylinos.cn>
Signed-off-by: Hans de Goede <johannes.goede@oss.qualcomm.com>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/video/fbdev/core/fbsysfs.c | 36 +++---------------------------
include/linux/fb.h | 1 -
2 files changed, 3 insertions(+), 34 deletions(-)

diff --git a/drivers/video/fbdev/core/fbsysfs.c b/drivers/video/fbdev/core/fbsysfs.c
index b8344c40073b4..baa2bae0fb5b3 100644
--- a/drivers/video/fbdev/core/fbsysfs.c
+++ b/drivers/video/fbdev/core/fbsysfs.c
@@ -12,8 +12,6 @@

#include "fb_internal.h"

-#define FB_SYSFS_FLAG_ATTR 1
-
static int activate(struct fb_info *fb_info, struct fb_var_screeninfo *var)
{
int err;
@@ -451,33 +449,7 @@ static struct attribute *fb_device_attrs[] = {
NULL,
};

-static const struct attribute_group fb_device_attr_group = {
- .attrs = fb_device_attrs,
-};
-
-static int fb_init_device(struct fb_info *fb_info)
-{
- int ret;
-
- dev_set_drvdata(fb_info->dev, fb_info);
-
- fb_info->class_flag |= FB_SYSFS_FLAG_ATTR;
-
- ret = device_add_group(fb_info->dev, &fb_device_attr_group);
- if (ret)
- fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
-
- return 0;
-}
-
-static void fb_cleanup_device(struct fb_info *fb_info)
-{
- if (fb_info->class_flag & FB_SYSFS_FLAG_ATTR) {
- device_remove_group(fb_info->dev, &fb_device_attr_group);
-
- fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
- }
-}
+ATTRIBUTE_GROUPS(fb_device);

int fb_device_create(struct fb_info *fb_info)
{
@@ -485,14 +457,13 @@ int fb_device_create(struct fb_info *fb_info)
dev_t devt = MKDEV(FB_MAJOR, node);
int ret;

- fb_info->dev = device_create(fb_class, fb_info->device, devt, NULL, "fb%d", node);
+ fb_info->dev = device_create_with_groups(fb_class, fb_info->device, devt, fb_info,
+ fb_device_groups, "fb%d", node);
if (IS_ERR(fb_info->dev)) {
/* Not fatal */
ret = PTR_ERR(fb_info->dev);
pr_warn("Unable to create device for framebuffer %d; error %d\n", node, ret);
fb_info->dev = NULL;
- } else {
- fb_init_device(fb_info);
}

return 0;
@@ -505,7 +476,6 @@ void fb_device_destroy(struct fb_info *fb_info)
if (!fb_info->dev)
return;

- fb_cleanup_device(fb_info);
device_destroy(fb_class, devt);
fb_info->dev = NULL;
}
diff --git a/include/linux/fb.h b/include/linux/fb.h
index 05cc251035da9..c3302d5135466 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -497,7 +497,6 @@ struct fb_info {
#if defined(CONFIG_FB_DEVICE)
struct device *dev; /* This is this fb device */
#endif
- int class_flag; /* private sysfs flags */
#ifdef CONFIG_FB_TILEBLITTING
struct fb_tile_ops *tileops; /* Tile Blitting */
#endif
--
2.51.0