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

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Date:   Tue, 11 Jul 2017 22:20:00 +0200
From:   Richard Cochran <richardcochran@...il.com>
To:     Ganesh Goudar <ganeshgr@...lsio.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        dan.carpenter@...cle.com, atul.gupta@...lsio.com
Subject: Re: [PATCH net] cxgb4: ptp_clock_register() returns error pointers

On Tue, Jul 11, 2017 at 07:54:38PM +0530, Ganesh Goudar wrote:
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ptp.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ptp.c
> index 50517cf..06c0de4 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) {
> +	if (IS_ERR_OR_NULL(adapter->ptp_clock)) {

But here you also need

		adapter->ptp_clock = NULL;

>  		dev_err(adapter->pdev_dev,
>  			"PTP %s Clock registration has failed\n", __func__);
>  		return;

because later on you have:

void cxgb4_ptp_stop(struct adapter *adapter)
{
	...

	if (adapter->ptp_clock) {
		ptp_clock_unregister(adapter->ptp_clock);
		adapter->ptp_clock = NULL;
	}
}

Thanks,
Richard