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Message-ID: <f36d88931187444302d1610bb9c54a386ff437cf.camel@iki.fi>
Subject: Re: [PATCH 1/1] Bluetooth: ISO: Allow binding a PA sync socket
From:   Pauli Virtanen <pav@iki.fi>
To:     Iulia Tanasescu <iulia.tanasescu@nxp.com>,
        linux-bluetooth@vger.kernel.org
Date:   Mon, 16 Oct 2023 19:30:36 +0300
In-Reply-To: <20231016154545.2883-2-iulia.tanasescu@nxp.com>
References: <20231016154545.2883-1-iulia.tanasescu@nxp.com>
         <20231016154545.2883-2-iulia.tanasescu@nxp.com>
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Hi,

ma, 2023-10-16 kello 18:45 +0300, Iulia Tanasescu kirjoitti:
> This makes it possible to bind a PA sync socket to a number of BISes
> before issuing the BIG Create Sync command.
>=20
> Signed-off-by: Iulia Tanasescu <iulia.tanasescu@nxp.com>
> ---
>  net/bluetooth/iso.c | 41 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 41 insertions(+)
>=20
> diff --git a/net/bluetooth/iso.c b/net/bluetooth/iso.c
> index 07b80e97aead..6938ff4accb3 100644
> --- a/net/bluetooth/iso.c
> +++ b/net/bluetooth/iso.c
> @@ -813,6 +813,40 @@ static int iso_sock_bind_bc(struct socket *sock, str=
uct sockaddr *addr,
>  	return 0;
>  }
> =20
> +static int iso_sock_bind_pa_sk(struct sock *sk, struct sockaddr_iso *sa,
> +			       int addr_len)
> +{
> +	int err =3D 0;
> +
> +	lock_sock(sk);
> +
> +	if (sk->sk_type !=3D SOCK_SEQPACKET) {
> +		err =3D -EINVAL;
> +		goto done;
> +	}
> +
> +	if (addr_len <=3D sizeof(*sa)) {
> +		err =3D -EINVAL;
> +		goto done;
> +	}
> +
> +	iso_pi(sk)->bc_num_bis =3D sa->iso_bc->bc_num_bis;
> +
> +	for (int i =3D 0; i < iso_pi(sk)->bc_num_bis; i++)
> +		if (sa->iso_bc->bc_bis[i] < 0x01 ||
> +		    sa->iso_bc->bc_bis[i] > 0x1f) {
> +			err =3D -EINVAL;
> +			goto done;
> +		}
> +
> +	memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
> +	       iso_pi(sk)->bc_num_bis);
> +
> +done:
> +	release_sock(sk);
> +	return err;
> +}
> +
>  static int iso_sock_bind(struct socket *sock, struct sockaddr *addr,
>  			 int addr_len)
>  {
> @@ -826,6 +860,13 @@ static int iso_sock_bind(struct socket *sock, struct=
 sockaddr *addr,
>  	    addr->sa_family !=3D AF_BLUETOOTH)
>  		return -EINVAL;
> =20
> +	/* Allow the user to bind a PA sync socket to a number
> +	 * of BISes to sync to.
> +	 */
> +	if (sk->sk_state =3D=3D BT_CONNECT2 &&
> +	    test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags))
> +		return iso_sock_bind_pa_sk(sk, sa, addr_len);
> +
>  	lock_sock(sk);

If there's no reason not to, could we do instead

	lock_sock(sk);

	if (sk->sk_state =3D=3D BT_CONNECT2 &&
	    test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags)) {
		err =3D iso_sock_bind_pa_sk(sk, sa, addr_len);
		goto done;
	}

so that we don't race between branching on sk->sk_state and then taking
the lock.=C2=A0iso_sock_bind_pa_sk wouldn't also need to do locking then.

> =20
>  	if (sk->sk_state !=3D BT_OPEN) {

--=20
Pauli Virtanen