From aef696eeab7a0a8122e9da3021b4310674539bb9 Mon Sep 17 00:00:00 2001 From: Phil Elwell Date: Tue, 5 May 2020 19:45:41 +0100 Subject: [PATCH] video: bcm2708_fb: Disable FB if no displays found If the firmware hasn't detected a display, the driver would assume one display was available, but because it had failed to retrieve the display size it would try to allocate a zero-sized buffer. Avoid the allocation failure by bailing out early if no display is found. See: https://github.com/raspberrypi/linux/issues/3598 Signed-off-by: Phil Elwell --- drivers/video/fbdev/bcm2708_fb.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) --- a/drivers/video/fbdev/bcm2708_fb.c +++ b/drivers/video/fbdev/bcm2708_fb.c @@ -1092,10 +1092,9 @@ static int bcm2708_fb_probe(struct platf * set one display */ if (ret || num_displays == 0) { - num_displays = 1; dev_err(&dev->dev, - "Unable to determine number of FB's. Assuming 1\n"); - ret = 0; + "Unable to determine number of FBs. Disabling driver.\n"); + return -ENOENT; } else { fbdev->firmware_supports_multifb = 1; }