From b818e2764cd9e1c83aefd1f71ecf65f013329147 Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Sat, 22 Aug 2026 11:56:02 +0300
Subject: [PATCH] Kernel: Only update USB max packet size for FS devices

---
 kernel/kernel/USB/XHCI/Device.cpp | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/kernel/kernel/USB/XHCI/Device.cpp b/kernel/kernel/USB/XHCI/Device.cpp
index d7677e32..37e32b9f 100644
--- a/kernel/kernel/USB/XHCI/Device.cpp
+++ b/kernel/kernel/USB/XHCI/Device.cpp
@@ -113,7 +113,8 @@ namespace Kernel
 			TRY(m_controller.send_command(address_device));
 		}
 
-		TRY(update_actual_max_packet_size());
+		if (m_speed_class == USB::SpeedClass::FullSpeed)
+			TRY(update_actual_max_packet_size());
 
 		return {};
 	}
@@ -134,18 +135,16 @@ namespace Kernel
 		request.wLength       = 8;
 		TRY(send_request(request, response_region->paddr()));
 
-		uint8_t bMaxPacketSize0;
-		PageTable::with_fast_page(response_region->paddr(), [&bMaxPacketSize0] {
-			bMaxPacketSize0 = PageTable::fast_page_as_sized<uint8_t>(7);
-		});
-
-		dprintln_if(DEBUG_XHCI, "Got device descriptor");
+		const uint8_t bMaxPacketSize0 = reinterpret_cast<const uint8_t*>(response_region->vaddr())[7];
 
 		const bool is_usb3 = (m_speed_class == USB::SpeedClass::SuperSpeed);
 		const uint32_t new_max_packet_size = is_usb3 ? 1u << bMaxPacketSize0 : bMaxPacketSize0;
 
 		if (m_endpoints[0].max_packet_size == new_max_packet_size)
+		{
+			dprintln_if(DEBUG_XHCI, "No need to update max packet size");
 			return {};
+		}
 
 		m_endpoints[0].max_packet_size = new_max_packet_size;