1 From 927defe02be209d870171b385673c58b6dfa6964 Mon Sep 17 00:00:00 2001
2 From: Phil Elwell <phil@raspberrypi.com>
3 Date: Tue, 5 May 2020 19:45:41 +0100
4 Subject: [PATCH] video: bcm2708_fb: Disable FB if no displays found
6 If the firmware hasn't detected a display, the driver would assume
7 one display was available, but because it had failed to retrieve the
8 display size it would try to allocate a zero-sized buffer.
10 Avoid the allocation failure by bailing out early if no display is
13 See: https://github.com/raspberrypi/linux/issues/3598
15 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
17 drivers/video/fbdev/bcm2708_fb.c | 5 ++---
18 1 file changed, 2 insertions(+), 3 deletions(-)
20 --- a/drivers/video/fbdev/bcm2708_fb.c
21 +++ b/drivers/video/fbdev/bcm2708_fb.c
22 @@ -1092,10 +1092,9 @@ static int bcm2708_fb_probe(struct platf
25 if (ret || num_displays == 0) {
28 - "Unable to determine number of FB's. Assuming 1\n");
30 + "Unable to determine number of FBs. Disabling driver.\n");
33 fbdev->firmware_supports_multifb = 1;