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platforms/drm: make failure of findWorkingCombination less severe

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While findWorkingCombination should never fail, in the case it does
KWin should not crash. To achieve that simply restore the old config
in case of failure.

CCBUG: 439873
This commit is contained in:
Xaver Hugl 2021-09-27 18:18:31 +02:00 committed by Nate Graham
parent d7d1c6600a
commit de674e087a
1 changed files with 15 additions and 3 deletions
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18
src/plugins/platforms/drm/drm_gpu.cpp
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@ -280,10 +280,11 @@ bool DrmGpu::updateOutputs()
plane->updateProperties();
}
// delete current pipelines of active outputs
// stash away current pipelines of active outputs
QMap<DrmOutput*, DrmPipeline*> oldPipelines;
for (const auto &output : qAsConst(m_drmOutputs)) {
m_pipelines.removeOne(output->pipeline());
delete output->pipeline();
oldPipelines.insert(output, output->pipeline());
output->setPipeline(nullptr);
}
@ -304,7 +305,18 @@ bool DrmGpu::updateOutputs()
planes.removeOne(output->pipeline()->primaryPlane());
}
}
const auto config = findWorkingCombination({}, connectors, crtcs, planes);
auto config = findWorkingCombination({}, connectors, crtcs, planes);
if (config.isEmpty() && !connectors.isEmpty()) {
qCCritical(KWIN_DRM) << "DrmGpu::findWorkingCombination failed to find any functional combinations! Reverting to the old configuration!";
for (auto it = oldPipelines.begin(); it != oldPipelines.end(); it++) {
it.value()->setOutput(it.key());
config << it.value();
}
} else {
for (const auto &pipeline : qAsConst(oldPipelines)) {
delete pipeline;
}
}
m_pipelines << config;
for (const auto &pipeline : config) {