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video: bcm2708_fb: Disable FB if no displays found

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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 <phil@raspberrypi.com>
This commit is contained in:
Phil Elwell
2020-05-05 19:45:41 +01:00
committed by popcornmix
parent 108c641476
commit e7f934bccf
1 changed files with 2 additions and 3 deletions
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5
drivers/video/fbdev/bcm2708_fb.c
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@@ -1092,10 +1092,9 @@ static int bcm2708_fb_probe(struct platform_device *dev)
* set one display * set one display
*/ */
if (ret || num_displays == 0) { if (ret || num_displays == 0) {
num_displays = 1;
dev_err(&dev->dev, dev_err(&dev->dev,
"Unable to determine number of FB's. Assuming 1\n"); "Unable to determine number of FBs. Disabling driver.\n");
ret = 0; return -ENOENT;
} else { } else {
fbdev->firmware_supports_multifb = 1; fbdev->firmware_supports_multifb = 1;
} }