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path: root/drivers/video/fbmem.c
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Diffstat (limited to 'drivers/video/fbmem.c')
-rw-r--r--drivers/video/fbmem.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index d412a1ddc12..f8a09bf8d0c 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1462,6 +1462,16 @@ static int fb_check_foreignness(struct fb_info *fi)
return 0;
}
+static bool fb_do_apertures_overlap(struct fb_info *gen, struct fb_info *hw)
+{
+ /* is the generic aperture base the same as the HW one */
+ if (gen->aperture_base == hw->aperture_base)
+ return true;
+ /* is the generic aperture base inside the hw base->hw base+size */
+ if (gen->aperture_base > hw->aperture_base && gen->aperture_base <= hw->aperture_base + hw->aperture_size)
+ return true;
+ return false;
+}
/**
* register_framebuffer - registers a frame buffer device
* @fb_info: frame buffer info structure
@@ -1485,6 +1495,23 @@ register_framebuffer(struct fb_info *fb_info)
if (fb_check_foreignness(fb_info))
return -ENOSYS;
+ /* check all firmware fbs and kick off if the base addr overlaps */
+ for (i = 0 ; i < FB_MAX; i++) {
+ if (!registered_fb[i])
+ continue;
+
+ if (registered_fb[i]->flags & FBINFO_MISC_FIRMWARE) {
+ if (fb_do_apertures_overlap(registered_fb[i], fb_info)) {
+ printk(KERN_ERR "fb: conflicting fb hw usage "
+ "%s vs %s - removing generic driver\n",
+ fb_info->fix.id,
+ registered_fb[i]->fix.id);
+ unregister_framebuffer(registered_fb[i]);
+ break;
+ }
+ }
+ }
+
num_registered_fb++;
for (i = 0 ; i < FB_MAX; i++)
if (!registered_fb[i])
@@ -1586,6 +1613,10 @@ unregister_framebuffer(struct fb_info *fb_info)
device_destroy(fb_class, MKDEV(FB_MAJOR, i));
event.info = fb_info;
fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
+
+ /* this may free fb info */
+ if (fb_info->fbops->fb_destroy)
+ fb_info->fbops->fb_destroy(fb_info);
done:
return ret;
}