From c1d8790623839dd0395a18e21a34a87f26cd2e7c Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Fri, 22 Nov 2024 22:19:29 +0200
Subject: [PATCH] Kernel: Don't allow sending commands to halted xHCI

---
 kernel/kernel/USB/XHCI/Controller.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kernel/kernel/USB/XHCI/Controller.cpp b/kernel/kernel/USB/XHCI/Controller.cpp
index 4d4ccebdb3..8df50bdb68 100644
--- a/kernel/kernel/USB/XHCI/Controller.cpp
+++ b/kernel/kernel/USB/XHCI/Controller.cpp
@@ -404,6 +404,13 @@ namespace Kernel
 	{
 		LockGuard _(m_mutex);
 
+		auto& operational = operational_regs();
+		if (operational.usbsts & XHCI::USBSTS::HCHalted)
+		{
+			dwarnln("Trying to send a command on a halted controller");
+			return BAN::Error::from_errno(EFAULT);
+		}
+
 		auto& command_trb = reinterpret_cast<volatile XHCI::TRB*>(m_command_ring_region->vaddr())[m_command_enqueue];
 		command_trb.raw.dword0 = trb.raw.dword0;
 		command_trb.raw.dword1 = trb.raw.dword1;