mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-22 06:57:57 +00:00
40 lines
1.4 KiB
Diff
40 lines
1.4 KiB
Diff
From d6baa1bd90e7e68ac69d5378d70174ea67bf35dc Mon Sep 17 00:00:00 2001
|
|
From: James Hughes <james.hughes@raspberrypi.org>
|
|
Date: Mon, 29 Jul 2019 12:02:59 +0100
|
|
Subject: [PATCH] Fixup FKMS interrupt handing for non-existent display
|
|
|
|
If an errant interrupt flag was received from a non-existent display,
|
|
a NULL pointer access was made. Protect against this by checking if a
|
|
second display is present prior to checking the interrupt flags.
|
|
---
|
|
drivers/gpu/drm/vc4/vc4_firmware_kms.c | 17 ++++++++++-------
|
|
1 file changed, 10 insertions(+), 7 deletions(-)
|
|
|
|
--- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
|
|
+++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
|
|
@@ -1087,14 +1087,17 @@ static irqreturn_t vc4_crtc_irq_handler(
|
|
vc4_crtc_handle_page_flip(crtc_list[0]);
|
|
}
|
|
|
|
- /* Check for the secondary display too */
|
|
- chan = readl(crtc_list[0]->regs + SMIDSW1);
|
|
+ if (crtc_list[1]) {
|
|
+ /* Check for the secondary display too */
|
|
+ chan = readl(crtc_list[0]->regs + SMIDSW1);
|
|
|
|
- if (chan & 1) {
|
|
- writel(SMI_NEW, crtc_list[0]->regs + SMIDSW1);
|
|
- if (crtc_list[1]->vblank_enabled)
|
|
- drm_crtc_handle_vblank(&crtc_list[1]->base);
|
|
- vc4_crtc_handle_page_flip(crtc_list[1]);
|
|
+ if (chan & 1) {
|
|
+ writel(SMI_NEW, crtc_list[0]->regs + SMIDSW1);
|
|
+
|
|
+ if (crtc_list[1]->vblank_enabled)
|
|
+ drm_crtc_handle_vblank(&crtc_list[1]->base);
|
|
+ vc4_crtc_handle_page_flip(crtc_list[1]);
|
|
+ }
|
|
}
|
|
}
|
|
|