From a53abedcfaec2d4cb5111aaa1be2698ebd556499 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Sat, 16 May 2026 17:19:31 +0800
Subject: [PATCH] usbip: cap iso packet count at linux USBIP_MAX_ISO_PACKETS

The accepted limit of 4096 was looser than Linux's hard cap of 1024 in
drivers/usb/usbip/usbip_common.h, so a real peer would reject submits we
considered valid. Tighten the validator to 1024 to match upstream before
multi-packet iso lands.
---
 service/usbip/data_protocol.go | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/service/usbip/data_protocol.go b/service/usbip/data_protocol.go
index 9ec05d02b..8d82d72cb 100644
--- a/service/usbip/data_protocol.go
+++ b/service/usbip/data_protocol.go
@@ -22,10 +22,11 @@ const (
 	unlinkBodySize               = 28
 	isoPacketDescriptorWireSize  = 16
 	maxUSBIPTransferBufferLength = 16 << 20
-	maxUSBIPIsoPackets           = 4096
-	nonIsoPacketCount            = -1
-	usbipTransferFlagIsoASAP     = 0x0002
-	usbipStatusECONNRESET        = -104
+	// matches Linux drivers/usb/usbip/usbip_common.h USBIP_MAX_ISO_PACKETS
+	maxUSBIPIsoPackets       = 1024
+	nonIsoPacketCount        = -1
+	usbipTransferFlagIsoASAP = 0x0002
+	usbipStatusECONNRESET    = -104
 )
 
 type DataHeader struct {