From c0e6e7d4090669944345c0b9a432e7548c1c6a11 Mon Sep 17 00:00:00 2001
From: zhanghongyuan <zhanghongyuan@uniontech.com>
Date: Fri, 23 Oct 2026 08:23:23 +0800
Subject: [PATCH] fix: clear stale boardVendorKey in else branch
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1. Root cause: checkBoardVendorFlag() else branch does not clear
   static boardVendorKey before dmidecode matching, leaving stale
   cache from previous calls across device type changes
2. Fix: add boardVendorKey = "" at else branch entry to reset cache,
   ensuring clean state before model detection begins
3. Impact: M900/W525 fallback logic now triggers correctly when no
   known model matches; specialComType != -1 branch unaffected

Log: Fixed board vendor detection on unknown device models

Influence:
1. Test board vendor detection on known models (KLVV/KLVU/PGUV/PGUW/PGUX)
2. Test M900/W525 fallback when dmidecode returns unknown model
3. Verify no regression on specialComType-based device detection

fix: 修复 else 分支中 boardVendorKey 缓存残留问题

1. 根因：checkBoardVendorFlag() else 分支在 dmidecode 匹配前未清空
   静态变量 boardVendorKey，导致跨调用缓存残留
2. 方案：在 else 分支入口处添加 boardVendorKey = "" 重置缓存，
   确保机型检测前状态干净
3. 影响：未知机型时 M900/W525 兜底逻辑恢复正常触发；不影响
   specialComType != -1 分支

Log: 修复未知机型设备的主板厂商检测问题

Influence:
1. 测试已知机型（KLVV/KLVU/PGUV/PGUW/PGUX）的主板厂商检测
2. 测试未知机型时 M900/W525 兜底逻辑是否正常触发
3. 验证 specialComType 分支的设备检测无回归

PMS: BUG-V-6376
---
 deepin-devicemanager/src/commonfunction.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/deepin-devicemanager/src/commonfunction.cpp b/deepin-devicemanager/src/commonfunction.cpp
index 9f8005469..7145c4661 100644
--- a/deepin-devicemanager/src/commonfunction.cpp
+++ b/deepin-devicemanager/src/commonfunction.cpp
@@ -181,6 +181,7 @@ QString Common::checkBoardVendorFlag()
             break;
         }
     }else{
+        boardVendorKey = "";
         QProcess process;
         process.start("dmidecode", QStringList() << "-s" << "system-product-name");
         process.waitForFinished(-1);