From e3d156ab0e020ade2a96ae82eba226d5f187aa2e Mon Sep 17 00:00:00 2001 From: bunnei Date: Fri, 26 Nov 2021 15:35:11 -0800 Subject: hle: kernel: svc: Fix deadlock that can occur with single core. --- src/core/hle/kernel/svc.cpp | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-) diff --git a/src/core/hle/kernel/svc.cpp b/src/core/hle/kernel/svc.cpp index 0e79e1be3..359cf515d 100644 --- a/src/core/hle/kernel/svc.cpp +++ b/src/core/hle/kernel/svc.cpp @@ -308,12 +308,18 @@ static ResultCode ConnectToNamedPort32(Core::System& system, Handle* out_handle, /// Makes a blocking IPC call to an OS service. static ResultCode SendSyncRequest(Core::System& system, Handle handle) { - auto& kernel = system.Kernel(); // Create the wait queue. KThreadQueue wait_queue(kernel); + // Get the client session from its handle. + KScopedAutoObject session = + kernel.CurrentProcess()->GetHandleTable().GetObject(handle); + R_UNLESS(session.IsNotNull(), ResultInvalidHandle); + + LOG_TRACE(Kernel_SVC, "called handle=0x{:08X}({})", handle, session->GetName()); + auto thread = kernel.CurrentScheduler()->GetCurrentThread(); { KScopedSchedulerLock lock(kernel); @@ -321,15 +327,7 @@ static ResultCode SendSyncRequest(Core::System& system, Handle handle) { // This is a synchronous request, so we should wait for our request to complete. GetCurrentThread(kernel).BeginWait(std::addressof(wait_queue)); GetCurrentThread(kernel).SetWaitReasonForDebugging(ThreadWaitReasonForDebugging::IPC); - - { - KScopedAutoObject session = - kernel.CurrentProcess()->GetHandleTable().GetObject(handle); - R_UNLESS(session.IsNotNull(), ResultInvalidHandle); - LOG_TRACE(Kernel_SVC, "called handle=0x{:08X}({})", handle, session->GetName()); - session->SendSyncRequest(&GetCurrentThread(kernel), system.Memory(), - system.CoreTiming()); - } + session->SendSyncRequest(&GetCurrentThread(kernel), system.Memory(), system.CoreTiming()); } return thread->GetWaitResult(); -- cgit v1.2.3