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From cd8b90a7a7185c3f177469d1a37654a9e8539cd1 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Jonas=20=C3=85dahl?= <jadahl@gmail.com>
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Date: Thu, 29 Sep 2022 14:23:55 +0200
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Subject: [PATCH 2/2] output/kms: Don't attemp to add common modes on
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connectors without modes
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We have no way to sanely add safe modes if there are no modes we can
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compare with, thus don't try.
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Fixes the following crash:
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#0 are_all_modes_equally_sized at ../src/backends/native/meta-output-kms.c:284
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#1 maybe_add_fallback_modes at ../src/backends/native/meta-output-kms.c:310
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#2 init_output_modes at ../src/backends/native/meta-output-kms.c:347
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#3 meta_output_kms_new at ../src/backends/native/meta-output-kms.c:414
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#4 init_outputs at ../src/backends/native/meta-gpu-kms.c:332
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#5 meta_gpu_kms_read_current at ../src/backends/native/meta-gpu-kms.c:368
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#6 meta_gpu_kms_new at ../src/backends/native/meta-gpu-kms.c:403
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#7 create_gpu_from_udev_device at ../src/backends/native/meta-backend-native.c:461
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#8 init_gpus at ../src/backends/native/meta-backend-native.c:551
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#9 meta_backend_native_initable_init at ../src/backends/native/meta-backend-native.c:632
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Fixes: 877cc3eb7d44e2886395151f763ec09bea350444
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Related: https://bugzilla.redhat.com/show_bug.cgi?id=2127801
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Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2646>
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(cherry picked from commit 2c8adb19660cb2cd53381372833e088962437d3b)
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---
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src/backends/native/meta-output-kms.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/src/backends/native/meta-output-kms.c b/src/backends/native/meta-output-kms.c
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index 9adc20bfd9..058ab7c053 100644
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--- a/src/backends/native/meta-output-kms.c
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+++ b/src/backends/native/meta-output-kms.c
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@@ -250,6 +250,9 @@ maybe_add_fallback_modes (const MetaKmsConnectorState *connector_state,
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MetaGpuKms *gpu_kms,
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MetaKmsConnector *kms_connector)
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{
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+ if (!connector_state->modes)
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+ return;
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+
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if (!connector_state->has_scaling)
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return;
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--
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2.37.1
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