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Kernel: Fix race condition completing IDEChannel async request

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Tom 2021-02-06 11:53:40 -07:00 committed by Andreas Kling
parent a66c9fc593
commit 8177f2474b
Notes: sideshowbarker 2024-07-18 21:21:01 +09:00 
Author: https://github.com/tomuta
Commit: https://github.com/SerenityOS/serenity/commit/8177f2474b2
Pull-request: https://github.com/SerenityOS/serenity/pull/5796
1 changed files with 3 additions and 0 deletions
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3
Kernel/Storage/IDEChannel.cpp
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@ -124,6 +124,7 @@ void IDEChannel::complete_current_request(AsyncDeviceRequest::RequestResult resu
// before Processor::deferred_call_queue returns!
Processor::deferred_call_queue([this, result]() {
dbgln_if(PATA_DEBUG, "IDEChannel::complete_current_request result: {}", (int)result);
ScopedSpinLock lock(m_request_lock);
VERIFY(m_current_request);
auto& request = *m_current_request;
m_current_request = nullptr;
@ -132,6 +133,7 @@ void IDEChannel::complete_current_request(AsyncDeviceRequest::RequestResult resu
if (result == AsyncDeviceRequest::Success) {
if (request.request_type() == AsyncBlockDeviceRequest::Read) {
if (!request.write_to_buffer(request.buffer(), m_dma_buffer_page->paddr().offset(0xc0000000).as_ptr(), 512 * request.block_count())) {
lock.unlock();
request.complete(AsyncDeviceRequest::MemoryFault);
return;
}
@ -142,6 +144,7 @@ void IDEChannel::complete_current_request(AsyncDeviceRequest::RequestResult resu
}
}
lock.unlock();
request.complete(result);
});
}