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40 lines
1.4 KiB
Diff
40 lines
1.4 KiB
Diff
From c2957d7709a43c81e5345d537feaa6980ffcc1a4 Mon Sep 17 00:00:00 2001
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From: James Hughes <james.hughes@raspberrypi.org>
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Date: Mon, 29 Jul 2019 12:02:59 +0100
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Subject: [PATCH] Fixup FKMS interrupt handing for non-existent display
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If an errant interrupt flag was received from a non-existent display,
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a NULL pointer access was made. Protect against this by checking if a
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second display is present prior to checking the interrupt flags.
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---
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drivers/gpu/drm/vc4/vc4_firmware_kms.c | 17 ++++++++++-------
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1 file changed, 10 insertions(+), 7 deletions(-)
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--- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
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+++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
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@@ -1056,14 +1056,17 @@ static irqreturn_t vc4_crtc_irq_handler(
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vc4_crtc_handle_page_flip(crtc_list[0]);
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}
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- /* Check for the secondary display too */
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- chan = readl(crtc_list[0]->regs + SMIDSW1);
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+ if (crtc_list[1]) {
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+ /* Check for the secondary display too */
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+ chan = readl(crtc_list[0]->regs + SMIDSW1);
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- if (chan & 1) {
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- writel(SMI_NEW, crtc_list[0]->regs + SMIDSW1);
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- if (crtc_list[1]->vblank_enabled)
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- drm_crtc_handle_vblank(&crtc_list[1]->base);
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- vc4_crtc_handle_page_flip(crtc_list[1]);
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+ if (chan & 1) {
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+ writel(SMI_NEW, crtc_list[0]->regs + SMIDSW1);
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+
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+ if (crtc_list[1]->vblank_enabled)
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+ drm_crtc_handle_vblank(&crtc_list[1]->base);
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+ vc4_crtc_handle_page_flip(crtc_list[1]);
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+ }
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}
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}
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