linux-kernel - Re: [[PATCH v2 iwl-next] v2 2/4] idpf: Acquire the lock before accessing the xn->salt

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Message-ID: <7ec98cd7-3659-426d-9665-075e2acb8592@intel.com>
Date: Thu, 29 Aug 2024 08:54:27 -0700
From: "Linga, Pavan Kumar" <pavan.kumar.linga@...el.com>
To: Manoj Vishwanathan <manojvishy@...gle.com>, Tony Nguyen
	<anthony.l.nguyen@...el.com>, Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
	<intel-wired-lan@...ts.osuosl.org>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<google-lan-reviews@...glegroups.com>
Subject: Re: [[PATCH v2 iwl-next] v2 2/4] idpf: Acquire the lock before
 accessing the xn->salt



On 8/26/2024 11:10 AM, Manoj Vishwanathan wrote:
> The transaction salt was being accessed before acquiring the
> idpf_vc_xn_lock when idpf has to forward the virtchnl reply.
> 
> Fixes: 34c21fa894a1a (“idpf: implement virtchnl transaction manager”)
> Signed-off-by: Manoj Vishwanathan <manojvishy@...gle.com>

Reviewed-by: Pavan Kumar Linga <pavan.kumar.linga@...el.com>

> ---
>   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 */