From adf96a529e10eaa90cdc3a4a02c88d5300c9ab52 Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@felloff.net>
Date: Mon, 13 May 2019 19:21:14 +0200
Subject: [PATCH] bcm: add cache invalidate before accessing prop buffer

---
 sys/src/9/bcm/vcore.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/src/9/bcm/vcore.c b/sys/src/9/bcm/vcore.c
index bc5b6a1b9..53293b0d4 100644
--- a/sys/src/9/bcm/vcore.c
+++ b/sys/src/9/bcm/vcore.c
@@ -147,7 +147,7 @@ vcreq(int tag, void *buf, int vallen, int rsplen)
 	prop->taglen = vallen;
 	if(vallen > 0)
 		memmove(prop->data, buf, vallen);
-	cachedwbinvse(prop, prop->len);
+	cachedwbinvse(prop, n);
 	for(;;){
 		aprop = busaddr? dmaaddr(prop) : (uintptr)prop;
 		vcwrite(ChanProps, aprop);
@@ -158,6 +158,7 @@ vcreq(int tag, void *buf, int vallen, int rsplen)
 			return -1;
 		busaddr = 0;
 	}
+	cachedinvse(prop, n);
 	if(prop->req == RspOk &&
 	   prop->tag == tag &&
 	   (prop->taglen&TagResp)) {