Re: [PATCH] net/af_iucv: fix virtual vs physical address confusion

Alexandra Winter
2024-02-15T13:41:13Z

On 15.02.24 09:05, Alexander Gordeev wrote:
> 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@linux.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,

Reviewed-by: Alexandra Winter <wintera@linux.ibm.com>

I would have preferred to do all the translations in __iucv_* functions in iucv.c,
but I understand that for __iucv_message_receive() this would mean significant changes.