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@gmail.com>
---
v1 -> v3:
      * Add space after comma.
      * v2 https://lore.kernel.org/lkml/20251028191615.2765711-1-rampxxxx@gmail.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..3b4c50d98ba6 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

Hi,

Helge Deller, added this extra space clean as a I received a bot msg.


---
Javier Garcia

On Sat, 8 Nov 2025 at 10:33, Javier Garcia <rampxxxx@gmail.com> wrote:
>
> 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@gmail.com>
> ---
> v1 -> v3:
>       * Add space after comma.
>       * v2 https://lore.kernel.org/lkml/20251028191615.2765711-1-rampxxxx@gmail.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..3b4c50d98ba6 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
>