linux-kernel - Re: [PATCH 3.9-stable] NTB: reset tx

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Date:	Sat, 18 May 2013 07:48:14 -0700
From:	Jon Mason <jon.mason@...el.com>
To:	Jonghwan Choi <jhbird.choi@...il.com>
Cc:	stable@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jonghwan Choi <jhbird.choi@...sung.com>
Subject: Re: [PATCH 3.9-stable] NTB: reset tx_index on link toggle

On Sat, May 18, 2013 at 11:47:17AM +0900, Jonghwan Choi wrote:
> From: Jon Mason <jon.mason@...el.com>
> 
> This patch looks like it should be in the 3.9-stable tree, should we apply
> it?

Yes, thanks.

> 
> ------------------
> 
> From: "Jon Mason <jon.mason@...el.com>"
> 
> commit 90f9e934647e652a69396e18c779215a493271cf upstream
> 
> If the NTB link toggles, the driver could stop receiving due to the
> tx_index not being set to 0 on the transmitting size on a link-up event.
> This is due to the driver expecting the incoming data to start at the
> beginning of the receive buffer and not at a random place.
> 
> Cc: <stable@...r.kernel.org> # 3.9.x: ad3e2751: ntb: off by one
> Cc: <stable@...r.kernel.org> # 3.9.x: cc0f868d: NTB: fix pointer math
> Cc: <stable@...r.kernel.org> # 3.9.x: 113fc505: NTB: Handle 64bit BAR
> Cc: <stable@...r.kernel.org> # 3.9.x: b77b2637: NTB: Link toggle memory
> Signed-off-by: Jon Mason <jon.mason@...el.com>
> Signed-off-by: Jonghwan Choi <jhbird.choi@...sung.com>
> ---
>  drivers/ntb/ntb_transport.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
> index f5a424d..0828124 100644
> --- a/drivers/ntb/ntb_transport.c
> +++ b/drivers/ntb/ntb_transport.c
> @@ -505,6 +505,7 @@ static void ntb_transport_setup_qp_mw(struct ntb_transport *nt,
>  
>  	qp->rx_pkts = 0;
>  	qp->tx_pkts = 0;
> +	qp->tx_index = 0;
>  }
>  
>  static void ntb_free_mw(struct ntb_transport *nt, int num_mw)
> @@ -819,7 +820,6 @@ static void ntb_transport_init_queue(struct ntb_transport *nt,
>  	qp->tx_mw = qp->rx_info + 1;
>  	qp->tx_max_frame = min(transport_mtu, tx_size);
>  	qp->tx_max_entry = tx_size / qp->tx_max_frame;
> -	qp->tx_index = 0;
>  
>  	if (nt->debugfs_dir) {
>  		char debugfs_name[4];
> -- 
> 1.8.1.2
> 
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