linux-kernel - Re: [PATCH] idpf: Acquire the lock before accessing the xn->salt

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Message-ID: <6830e66d-e019-4197-ba40-0d1662360fdb@intel.com>
Date: Mon, 5 Aug 2024 15:37:03 +0200
From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
To: Manoj Vishwanathan <manojvishy@...gle.com>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>, David Decotigny
	<decot@...gle.com>, Tony Nguyen <anthony.l.nguyen@...el.com>, "David S.
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
	<intel-wired-lan@...ts.osuosl.org>
Subject: Re: [PATCH] idpf: Acquire the lock before accessing the xn->salt

On 8/3/24 20:25, Manoj Vishwanathan wrote:
> The transaction salt was being accessed
> before acquiring the idpf_vc_xn_lock when idpf has to forward the
> virtchnl reply

nits: This text would fit into two lines (the column limit is 75).
Missing dot at the very end.

> 
> Signed-off-by: Manoj Vishwanathan <manojvishy@...gle.com>

thank you!, code looks fine

it would be great if you could add a Fixes: tag, and add iwl-net as
the target tree

> ---
>   drivers/net/ethernet/intel/idpf/idpf_virtchnl.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c b/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
> index 70986e12da28..30eec674d594 100644
> --- a/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
> +++ b/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
> @@ -612,14 +612,15 @@ idpf_vc_xn_forward_reply(struct idpf_adapter *adapter,
>   		return -EINVAL;
>   	}
>   	xn = &adapter->vcxn_mngr->ring[xn_idx];
> +	idpf_vc_xn_lock(xn);
>   	salt = FIELD_GET(IDPF_VC_XN_SALT_M, msg_info);
>   	if (xn->salt != salt) {
>   		dev_err_ratelimited(&adapter->pdev->dev, "Transaction salt does not match (%02x != %02x)\n",
>   				    xn->salt, salt);
> +		idpf_vc_xn_unlock(xn);
>   		return -EINVAL;
>   	}
>   
> -	idpf_vc_xn_lock(xn);
>   	switch (xn->state) {
>   	case IDPF_VC_XN_WAITING:
>   		/* success */