Re: [RFC PATCH v2 2/3] vsock/vmci: convert VMCI error code to -ENOMEM

[Stefano Garzarella <sgarzare@xxxxxxxxxx>]

On Thu, Mar 30, 2023 at 10:07:36AM +0300, Arseniy Krasnov wrote:
> This adds conversion of VMCI specific error code to general -ENOMEM. It
> is needed, because af_vsock.c passes error value returned from transport
> to the user.
>
> Signed-off-by: Arseniy Krasnov <AVKrasnov@xxxxxxxxxxxxxx>
> ---
> net/vmw_vsock/vmci_transport.c | 19 ++++++++++++++++---
> 1 file changed, 16 insertions(+), 3 deletions(-)
>
> diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c
> index 36eb16a40745..45de3e75597f 100644
> --- a/net/vmw_vsock/vmci_transport.c
> +++ b/net/vmw_vsock/vmci_transport.c
> @@ -1831,10 +1831,17 @@ static ssize_t vmci_transport_stream_dequeue(
> 	size_t len,
> 	int flags)
> {
> +	int err;

Please, use the same type returned by the function.

> +
> 	if (flags & MSG_PEEK)
> -		return vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0);
> +		err = vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0);
> 	else
> -		return vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0);
> +		err = vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0);
> +
> +	if (err < 0)
> +		err = -ENOMEM;
> +
> +	return err;
> }
>
> static ssize_t vmci_transport_stream_enqueue(
> @@ -1842,7 +1849,13 @@ static ssize_t vmci_transport_stream_enqueue(
> 	struct msghdr *msg,
> 	size_t len)
> {
> -	return vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0);
> +	int err;

Ditto.

> +
> +	err = vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0);
> +	if (err < 0)
> +		err = -ENOMEM;
> +
> +	return err;
> }

@Vishnu: should we backport the change for
vmci_transport_stream_enqueue() to stable branches?

In this case I would split this patch and I would send the
vmci_transport_stream_enqueue() change to the net branch including:

Fixes: c43170b7e157 ("vsock: return errors other than -ENOMEM to socket")

Thanks,
Stefano