Merge tag 'drm-misc-next-2022-06-17' of git://anongit.freedesktop.org/drm/drm-misc...

[linux-2.6-microblaze.git] / drivers / video / fbdev / core / fbmem.c

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 2a1a425..c4a1832 100644 (file)
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -19,6 +19,7 @@
 #include <linux/kernel.h>
 #include <linux/major.h>
 #include <linux/slab.h>
+#include <linux/sysfb.h>
 #include <linux/mm.h>
 #include <linux/mman.h>
 #include <linux/vt.h>
@@ -1764,6 +1765,17 @@ int remove_conflicting_framebuffers(struct apertures_struct *a,
                do_free = true;
        }
 
+       /*
+        * If a driver asked to unregister a platform device registered by
+        * sysfb, then can be assumed that this is a driver for a display
+        * that is set up by the system firmware and has a generic driver.
+        *
+        * Drivers for devices that don't have a generic driver will never
+        * ask for this, so let's assume that a real driver for the display
+        * was already probed and prevent sysfb to register devices later.
+        */
+       sysfb_disable();
+
        mutex_lock(&registration_lock);
        do_remove_conflicting_framebuffers(a, name, primary);
        mutex_unlock(&registration_lock);