linux-kernel - [PATCH] net/af_iucv: fix virtual vs physical address confusion

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Message-Id: <20240215080500.2616848-1-agordeev@linux.ibm.com>
Date: Thu, 15 Feb 2024 09:05:00 +0100
From: Alexander Gordeev <agordeev@...ux.ibm.com>
To: Alexandra Winter <wintera@...ux.ibm.com>,
        Thorsten Winkler <twinkler@...ux.ibm.com>
Cc: linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net/af_iucv: fix virtual vs physical address confusion

Fix virtual vs physical address confusion. This does not fix a bug
since virtual and physical address spaces are currently the same.

Signed-off-by: Alexander Gordeev <agordeev@...ux.ibm.com>
---
 net/iucv/af_iucv.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index 498a0c35b7bb..4aa1c72e6c49 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -1060,13 +1060,12 @@ static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
 			int i;
 
 			/* skip iucv_array lying in the headroom */
-			iba[0].address = (u32)(addr_t)skb->data;
+			iba[0].address = (u32)virt_to_phys(skb->data);
 			iba[0].length = (u32)skb_headlen(skb);
 			for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 				skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 
-				iba[i + 1].address =
-					(u32)(addr_t)skb_frag_address(frag);
+				iba[i + 1].address = (u32)virt_to_phys(skb_frag_address(frag));
 				iba[i + 1].length = (u32)skb_frag_size(frag);
 			}
 			err = pr_iucv->message_send(iucv->path, &txmsg,
@@ -1162,13 +1161,12 @@ static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
 			struct iucv_array *iba = (struct iucv_array *)skb->head;
 			int i;
 
-			iba[0].address = (u32)(addr_t)skb->data;
+			iba[0].address = (u32)virt_to_phys(skb->data);
 			iba[0].length = (u32)skb_headlen(skb);
 			for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 				skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 
-				iba[i + 1].address =
-					(u32)(addr_t)skb_frag_address(frag);
+				iba[i + 1].address = (u32)virt_to_phys(skb_frag_address(frag));
 				iba[i + 1].length = (u32)skb_frag_size(frag);
 			}
 			rc = pr_iucv->message_receive(path, msg,
-- 
2.40.1