netdev - Re: [PATCH 2/2 net] cxgb4: ptp_clock_register() returns error pointers

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Message-ID: <20170710095645.sqyl2i5de3duxxtl@localhost.localdomain>
Date:   Mon, 10 Jul 2017 11:56:45 +0200
From:   Richard Cochran <richardcochran@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Ganesh Goudar <ganeshgr@...lsio.com>,
        Atul Gupta <atul.gupta@...lsio.com>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 2/2 net] cxgb4: ptp_clock_register() returns error
 pointers

On Mon, Jul 10, 2017 at 10:16:15AM +0300, Dan Carpenter wrote:
> We're checking ptp_clock_register() for NULL but we should be checking
> for error pointers.

No.

> diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ptp.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ptp.c
> index 50517cfd9671..c24313a103c6 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ptp.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ptp.c
> @@ -441,7 +441,7 @@ void cxgb4_ptp_init(struct adapter *adapter)
>  
>  	adapter->ptp_clock = ptp_clock_register(&adapter->ptp_clock_info,
>  						&adapter->pdev->dev);
> -	if (!adapter->ptp_clock) {

Yeah, that is wrong, but the fix is to check to IS_ERR or NULL.

Thanks,
Richard