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Kernel: Don't VERIFY that the DMA channel is running on AC'97 interrupt

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Fixes #13771; as discussed it's not really a problem to receive an
interrupt while the DMA channel is not running, but we do want to log
it.
This commit is contained in:
kleines Filmröllchen 2022-06-04 22:29:40 +02:00 committed by Idan Horowitz
parent 2c647da0b5
commit 1b25513ed7
Notes: sideshowbarker 2024-07-17 10:10:04 +09:00 
Author: https://github.com/kleinesfilmroellchen
Commit: https://github.com/SerenityOS/serenity/commit/1b25513ed7
Pull-request: https://github.com/SerenityOS/serenity/pull/14187
Issue: https://github.com/SerenityOS/serenity/issues/13771
Reviewed-by: https://github.com/IdanHo ✅
Reviewed-by: https://github.com/bgianfo
Reviewed-by: https://github.com/gmta ✅
Reviewed-by: https://github.com/supercomputer7
2 changed files with 19 additions and 6 deletions
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17
Kernel/Devices/Audio/AC97.cpp
View File

@ -4,6 +4,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Format.h>
#include <Kernel/Devices/Audio/AC97.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/Memory/AnonymousVMObject.h>
@ -274,8 +275,12 @@ ErrorOr<void> AC97::write_single_buffer(UserOrKernelBuffer const& data, size_t o
void AC97::AC97Channel::handle_dma_stopped()
{
dbgln_if(AC97_DEBUG, "AC97 @ {}: channel {}: DMA engine has stopped", m_device.pci_address(), name());
VERIFY(m_dma_running);
m_dma_running = false;
m_dma_running.with([this](auto& dma_running) {
// NOTE: QEMU might send spurious interrupts while we're not running, so we don't want to panic here.
if (!dma_running)
dbgln("AC97 @ {}: received DMA interrupt while it wasn't running", m_device.pci_address());
dma_running = false;
});
}
void AC97::AC97Channel::reset()
@ -288,7 +293,9 @@ void AC97::AC97Channel::reset()
while ((control_register.in<u8>() & AudioControlRegisterFlag::ResetRegisters) > 0)
IO::delay(50);
m_dma_running = false;
m_dma_running.with([](auto& dma_running) {
dma_running = false;
});
}
void AC97::AC97Channel::set_last_valid_index(u32 buffer_address, u8 last_valid_index)
@ -310,7 +317,9 @@ void AC97::AC97Channel::start_dma()
control |= AudioControlRegisterFlag::InterruptOnCompletionEnable;
control_register.out(control);
m_dma_running = true;
m_dma_running.with([](auto& dma_running) {
dma_running = true;
});
}
}

8
Kernel/Devices/Audio/AC97.h
View File

@ -13,6 +13,7 @@
#include <Kernel/Devices/Audio/Controller.h>
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/Interrupts/IRQHandler.h>
#include <Kernel/Locking/SpinlockProtected.h>
namespace Kernel {
@ -129,7 +130,10 @@ private:
{
}
bool dma_running() const { return m_dma_running; }
bool dma_running() const
{
return m_dma_running.with([](auto value) { return value; });
}
void handle_dma_stopped();
StringView name() const { return m_name; }
IOAddress reg(Register reg) const { return m_channel_base.offset(reg); }
@ -140,7 +144,7 @@ private:
private:
IOAddress m_channel_base;
AC97& m_device;
bool m_dma_running { false };
SpinlockProtected<bool> m_dma_running { false };
StringView m_name;
};