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Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0708-video-bcm2708_fb-Disable-FB-if-no-displays-found.patch')
-rw-r--r--target/linux/bcm27xx/patches-5.4/950-0708-video-bcm2708_fb-Disable-FB-if-no-displays-found.patch34
1 files changed, 34 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0708-video-bcm2708_fb-Disable-FB-if-no-displays-found.patch b/target/linux/bcm27xx/patches-5.4/950-0708-video-bcm2708_fb-Disable-FB-if-no-displays-found.patch
new file mode 100644
index 0000000000..90cb5e276e
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0708-video-bcm2708_fb-Disable-FB-if-no-displays-found.patch
@@ -0,0 +1,34 @@
+From e005a4db95a48e8b14a2017bf56a0e3f3dccfa6d Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.com>
+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 <phil@raspberrypi.com>
+---
+ 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
+@@ -1104,10 +1104,9 @@ 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;
+ }