linux-kernel - [PATCH v3 1/4] fb: Add dev_of_fbinfo() helper for optional sysfs support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251230052827.4676-2-chintanlike@gmail.com>
Date: Mon, 29 Dec 2025 21:28:19 -0800
From: Chintan Patel <chintanlike@...il.com>
To: linux-fbdev@...r.kernel.org,
	linux-staging@...ts.linux.dev,
	linux-omap@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	tzimmermann@...e.de,
	andy@...nel.org,
	deller@....de,
	gregkh@...uxfoundation.org,
	Chintan Patel <chintanlike@...il.com>
Subject: [PATCH v3 1/4] fb: Add dev_of_fbinfo() helper for optional sysfs support

Add dev_of_fbinfo() to return the framebuffer struct device when
CONFIG_FB_DEVICE is enabled, or NULL otherwise.

This allows fbdev drivers to use sysfs interfaces via runtime checks
instead of CONFIG_FB_DEVICE ifdefs, keeping the code clean while
remaining fully buildable.

Suggested-by: Helge Deller <deller@....de>
Signed-off-by: Chintan Patel <chintanlike@...il.com>
---
 include/linux/fb.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/fb.h b/include/linux/fb.h
index 05cc251035da..dad3fb61a06a 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -628,6 +628,15 @@ static inline void unlock_fb_info(struct fb_info *info)
 	mutex_unlock(&info->lock);
 }
 
+static inline struct device *dev_of_fbinfo(const struct fb_info *info)
+{
+#ifdef CONFIG_FB_DEVICE
+	return info->dev;
+#else
+	return NULL;
+#endif
+}
+
 static inline void __fb_pad_aligned_buffer(u8 *dst, u32 d_pitch,
 					   u8 *src, u32 s_pitch, u32 height)
 {
-- 
2.43.0