linux-kernel - Re: [PATCH v3 2/2] Bluetooth: sco: new getsockopt options BT_SNDMTU/BT

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Message-ID: <20200910082000.aiw74ll3z776yqgh@pali>
Date:   Thu, 10 Sep 2020 10:20:00 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Joseph Hwang <josephsih@...omium.org>
Cc:     linux-bluetooth@...r.kernel.org, marcel@...tmann.org,
        luiz.dentz@...il.com, chromeos-bluetooth-upstreaming@...omium.org,
        josephsih@...gle.com, Alain Michaud <alainm@...omium.org>,
        Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v3 2/2] Bluetooth: sco: new getsockopt options
 BT_SNDMTU/BT_RCVMTU

On Thursday 10 September 2020 14:04:02 Joseph Hwang wrote:
> This patch defines new getsockopt options BT_SNDMTU/BT_RCVMTU
> for SCO socket to be compatible with other bluetooth sockets.
> These new options return the same value as option SCO_OPTIONS
> which is already present on existing kernels.
> 
> Reviewed-by: Alain Michaud <alainm@...omium.org>
> Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
> Signed-off-by: Joseph Hwang <josephsih@...omium.org>

Looks good,

Reviewed-by: Pali Rohár <pali@...nel.org>

> ---
> 
> Changes in v3:
> - Fixed the commit message.
> 
> Changes in v2:
> - Used BT_SNDMTU/BT_RCVMTU instead of creating a new opt name.
> - Used the existing conn->mtu instead of creating a new member
>   in struct sco_pinfo.
> - Noted that the old SCO_OPTIONS in sco_sock_getsockopt_old()
>   would just work as it uses sco_pi(sk)->conn->mtu.
> 
>  net/bluetooth/sco.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
> index dcf7f96ff417e6..79ffcdef0b7ad5 100644
> --- a/net/bluetooth/sco.c
> +++ b/net/bluetooth/sco.c
> @@ -1001,6 +1001,12 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname,
>  			err = -EFAULT;
>  		break;
>  
> +	case BT_SNDMTU:
> +	case BT_RCVMTU:
> +		if (put_user(sco_pi(sk)->conn->mtu, (u32 __user *)optval))
> +			err = -EFAULT;
> +		break;
> +
>  	default:
>  		err = -ENOPROTOOPT;
>  		break;
> -- 
> 2.28.0.618.gf4bc123cb7-goog
>