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Kernel: Fix race conditions processing async device requests

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This commit is contained in:
Tom
2021-02-06 16:59:32 -07:00
committed by Andreas Kling
parent 8177f2474b
commit 5ccc3637e3
4 changed files with 23 additions and 41 deletions
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19
Kernel/Devices/Device.cpp
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@@ -82,20 +82,15 @@ String Device::absolute_path(const FileDescription&) const
void Device::process_next_queued_request(Badge<AsyncDeviceRequest>, const AsyncDeviceRequest& completed_request)
{
AsyncDeviceRequest* next_request = nullptr;
{
ScopedSpinLock lock(m_requests_lock);
VERIFY(!m_requests.is_empty());
VERIFY(m_requests.first().ptr() == &completed_request);
m_requests.remove(m_requests.begin());
if (!m_requests.is_empty())
next_request = m_requests.first().ptr();
ScopedSpinLock lock(m_requests_lock);
VERIFY(!m_requests.is_empty());
VERIFY(m_requests.first().ptr() == &completed_request);
m_requests.remove(m_requests.begin());
if (!m_requests.is_empty()) {
auto* next_request = m_requests.first().ptr();
next_request->do_start(move(lock));
}
if (next_request)
next_request->start();
evaluate_block_conditions();
}