From 02329a7d552bb916750d4527d87a42a53c89f8bd Mon Sep 17 00:00:00 2001
From: none <none>
Date: Tue, 31 Mar 2020 16:38:49 +0200
Subject: [PATCH] check if link exists

---
 ddbridge/ddbridge-io.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ddbridge/ddbridge-io.c b/ddbridge/ddbridge-io.c
index 6792180..4c696f3 100644
--- a/ddbridge/ddbridge-io.c
+++ b/ddbridge/ddbridge-io.c
@@ -65,6 +65,8 @@ u32 ddbreadl(struct ddb *dev, u32 adr)
 		u32 val, l = (adr >> DDB_LINK_SHIFT) & 3;
 		struct ddb_link *link = &dev->link[l];
 
+		if (!link->regs)
+			return 0;
 		spin_lock_irqsave(&link->lock, flags);
 		gtlw(link);
 		ddblwritel0(link, adr & 0xfffc, link->regs + 0x14);
@@ -84,6 +86,8 @@ void ddbwritel(struct ddb *dev, u32 val, u32 adr)
 		u32 l = (adr >> DDB_LINK_SHIFT);
 		struct ddb_link *link = &dev->link[l];
 
+		if (!link->regs)
+			return;
 		spin_lock_irqsave(&link->lock, flags);
 		gtlw(link);
 		ddblwritel0(link, 0xf0000 | (adr & 0xfffc), link->regs + 0x14);