linux-kernel - Re: [PATCH v2] l2cap_core: automatically flushable packets aren't allowed on LE links

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Message-Id: <C7C04F3A-EC21-4E71-9550-68E50901947D@holtmann.org>
Date:	Wed, 19 Nov 2014 22:48:25 +0800
From:	Marcel Holtmann <marcel@...tmann.org>
To:	Steven Walter <stevenrwalter@...il.com>
Cc:	"Gustavo F. Padovan" <gustavo@...ovan.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	BlueZ development <linux-bluetooth@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] l2cap_core: automatically flushable packets aren't allowed on LE links

Hi Steven,

you need to prefix the subject line with Bluetooth: like all other patches do.

> On Nov 19, 2014, at 22:41, Steven Walter <stevenrwalter@...il.com> wrote:
> 
> The bluetooth spec states that automatically flushable packets may not
> be sent over a LE-U link.
> 
> Signed-off-by: Steven Walter <stevenrwalter@...il.com>
> ---
> net/bluetooth/l2cap_core.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
> index 4af3821..028fcc6 100644
> --- a/net/bluetooth/l2cap_core.c
> +++ b/net/bluetooth/l2cap_core.c
> @@ -764,7 +764,7 @@ static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
> 	if (!skb)
> 		return;
> 
> -	if (lmp_no_flush_capable(conn->hcon->hdev))
> +	if (lmp_no_flush_capable(conn->hcon->hdev) || (conn->hcon->type == LE_LINK))

no need for ( ) around that new statement.

> 		flags = ACL_START_NO_FLUSH;
> 	else
> 		flags = ACL_START;
> @@ -798,8 +798,9 @@ static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
> 		return;
> 	}
> 
> -	if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
> -	    lmp_no_flush_capable(hcon->hdev))
> +	if ((hcon->type == LE_LINK) ||

Same here, the ( ) are not needed.

> +	    (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
> +	    lmp_no_flush_capable(hcon->hdev)))
> 		flags = ACL_START_NO_FLUSH;
> 	else
> 		flags = ACL_START;

I wonder actually if we should have a helper function or add comments to explain why we are doing it this complicated.

Regards

Marcel

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