linux-kernel - [PATCH v2] fbdev: vga16fb: Request memory region.

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Message-ID: <20251028191615.2765711-1-rampxxxx@gmail.com>
Date: Tue, 28 Oct 2025 20:16:15 +0100
From: Javier Garcia <rampxxxx@...il.com>
To: deller@....de
Cc: linux-fbdev@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	shuah@...nel.org,
	Javier Garcia <rampxxxx@...il.com>
Subject: [PATCH v2] fbdev: vga16fb: Request memory region.

This patch reserve and release VGA memory region.

This align with Documentation/drm/todo.rst
"Request memory regions in all fbdev drivers"

I've tested with 32bits kernel and qemu.

Signed-off-by: Javier Garcia <rampxxxx@...il.com>
---
v1 -> v2:
      * Add release in vga16fb_remove , thanks Helge Deller.
      * v1 https://lore.kernel.org/lkml/20251016171845.1397153-1-rampxxxx@gmail.com/

 drivers/video/fbdev/vga16fb.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/video/fbdev/vga16fb.c b/drivers/video/fbdev/vga16fb.c
index eedab14c7d51..208e3eefb3ff 100644
--- a/drivers/video/fbdev/vga16fb.c
+++ b/drivers/video/fbdev/vga16fb.c
@@ -1319,6 +1319,11 @@ static int vga16fb_probe(struct platform_device *dev)
 	if (ret)
 		return ret;
 
+	if (!request_mem_region(vga16fb_fix.smem_start, vga16fb_fix.smem_len,
+				"vga16b")) {
+		dev_err(&dev->dev,"vga16b: cannot reserve video memory at 0x%lx\n",
+		       vga16fb_fix.smem_start);
+	}
 	printk(KERN_DEBUG "vga16fb: initializing\n");
 	info = framebuffer_alloc(sizeof(struct vga16fb_par), &dev->dev);
 
@@ -1398,6 +1403,8 @@ static int vga16fb_probe(struct platform_device *dev)
  err_ioremap:
 	framebuffer_release(info);
  err_fb_alloc:
+	release_mem_region(vga16fb_fix.smem_start,
+		    vga16fb_fix.smem_len);
 	return ret;
 }
 
@@ -1407,6 +1414,8 @@ static void vga16fb_remove(struct platform_device *dev)
 
 	if (info)
 		unregister_framebuffer(info);
+	release_mem_region(vga16fb_fix.smem_start,
+		    vga16fb_fix.smem_len);
 }
 
 static const struct platform_device_id vga16fb_driver_id_table[] = {
-- 
2.50.1