netdev - Re: [PATCH net-next 01/11] net: aquantia: PTP skeleton declarations and callbacks

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Message-ID: <20190910191029.GE9761@lunn.ch>
Date:   Tue, 10 Sep 2019 21:10:29 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Igor Russkikh <Igor.Russkikh@...antia.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Egor Pomozov <Egor.Pomozov@...antia.com>,
        Sergey Samoilenko <Sergey.Samoilenko@...antia.com>,
        Dmitry Bezrukov <Dmitry.Bezrukov@...antia.com>
Subject: Re: [PATCH net-next 01/11] net: aquantia: PTP skeleton declarations
 and callbacks

On Mon, Sep 09, 2019 at 01:38:38PM +0000, Igor Russkikh wrote:
> From: Dmitry Bezrukov <dmitry.bezrukov@...antia.com>

Hi Igor, et al.

> @@ -331,6 +332,10 @@ int aq_nic_init(struct aq_nic_s *self)
>  		self->aq_vecs > i; ++i, aq_vec = self->aq_vec[i])
>  		aq_vec_init(aq_vec, self->aq_hw_ops, self->aq_hw);

> +int aq_ptp_init(struct aq_nic_s *aq_nic, unsigned int idx_vec)
> +{
> +	struct hw_atl_utils_mbox mbox;
> +	struct ptp_clock *clock;
> +	struct aq_ptp_s *self;

I find the use of self in this code quite confusing. It does not
appear to have a clear meaning. It can be a aq_ring_s, aq_nic_c,
aq_hw_s, aq_vec_s.

Looking at this code i always have to figure out what self is. Could
you not just use struct aq_ptp_s aq_ptp consistently in the code?

> +	int err = 0;
> +
> +	hw_atl_utils_mpi_read_stats(aq_nic->aq_hw, &mbox);
> +
> +	if (!(mbox.info.caps_ex & BIT(CAPS_EX_PHY_PTP_EN))) {
> +		aq_nic->aq_ptp = NULL;
> +		return 0;
> +	}
> +
> +	self = kzalloc(sizeof(*self), GFP_KERNEL);

Using devm_kzalloc() will make your clean up easier.

> +void aq_ptp_free(struct aq_nic_s *aq_nic)
> +{
> +	struct aq_ptp_s *self = aq_nic->aq_ptp;
> +
> +	if (!self)
> +		return;
> +
> +	kfree(self);

kfree() is happy to take a NULL pointer. But this could all go away
with devm_kzalloc().

     Andrew