This patch reserve and release VGA memory region with `*_mem_region`
fn's.

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

I've tested with kernel and qemu both 32bits.

Signed-off-by: Javier Garcia <[email protected]>
---

When I've run the code always return -EBUSY which makes sense as
mem is already requested,`/proc/iomem` shows `000a0000-000bffff : Video RAM 
area`.

I've seen that `cirrusfb` has this kind of code wrapped up with `#if 0`, and I
wonder if it makes sense to also wrap up with `#if 0`, at least , in
that way the code gets commented about expected behavior.


 drivers/video/fbdev/vga16fb.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/video/fbdev/vga16fb.c b/drivers/video/fbdev/vga16fb.c
index eedab14c7d51..f506bf144a97 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;
 }
 
-- 
2.50.1

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