netdev - Re: [PATCH net-next v5 1/3] net: ethernet: ti: Add accessors for struct k3_cppi_desc

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Message-ID: <ZghZur10+3WvZnDu@shell.armlinux.org.uk>
Date: Sat, 30 Mar 2024 18:28:10 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Naveen Mamindlapalli <naveenm@...vell.com>
Cc: Julien Panis <jpanis@...libre.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	Simon Horman <horms@...nel.org>, Andrew Lunn <andrew@...n.ch>,
	Ratheesh Kannoth <rkannoth@...vell.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"bpf@...r.kernel.org" <bpf@...r.kernel.org>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>
Subject: Re: [PATCH net-next v5 1/3] net: ethernet: ti: Add accessors for
 struct k3_cppi_desc_pool members

On Thu, Mar 28, 2024 at 12:06:56PM +0000, Naveen Mamindlapalli wrote:
> > diff --git a/drivers/net/ethernet/ti/k3-cppi-desc-pool.c b/drivers/net/ethernet/ti/k3-
> > cppi-desc-pool.c
> > index 05cc7aab1ec8..fe8203c05731 100644
> > --- a/drivers/net/ethernet/ti/k3-cppi-desc-pool.c
> > +++ b/drivers/net/ethernet/ti/k3-cppi-desc-pool.c
> > @@ -132,5 +132,17 @@ size_t k3_cppi_desc_pool_avail(struct
> > k3_cppi_desc_pool *pool)  }  EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_avail);
> > 
> > +size_t k3_cppi_desc_pool_desc_size(struct k3_cppi_desc_pool *pool) {
> > +	return pool->desc_size;
> 
> Don't you need to add NULL check on pool ptr since this function is exported?

What bearing does exporting a function have on whether it should check
for NULL?

Given that this function returns size_t, it can't return an error
number. So what value would it return if "pool" were NULL? It can
only return a positive integer or zero.

Also, the argument should be const as the function doesn't modify the
contents of "pool".

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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