Re: [PATCH net-next v3 1/3] net: document return value of dev_getbyhwaddr_rcu()
From: Kuniyuki Iwashima
Date: Thu Feb 13 2025 - 05:46:23 EST
From: Breno Leitao <leitao@xxxxxxxxxx>
Date: Thu, 13 Feb 2025 02:16:36 -0800
> Hello Kuniyuki,
>
> On Thu, Feb 13, 2025 at 04:47:48PM +0900, Kuniyuki Iwashima wrote:
> > From: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
> > Date: Thu, 13 Feb 2025 16:36:46 +0900
> > > From: Breno Leitao <leitao@xxxxxxxxxx>
> > > Date: Wed, 12 Feb 2025 09:47:24 -0800
> > > > diff --git a/net/core/dev.c b/net/core/dev.c
> > > > index d5ab9a4b318ea4926c200ef20dae01eaafa18c6b..0b3480a125fcaa6f036ddf219c29fa362ea0cb29 100644
> > > > --- a/net/core/dev.c
> > > > +++ b/net/core/dev.c
> > > > @@ -1134,8 +1134,8 @@ int netdev_get_name(struct net *net, char *name, int ifindex)
> > > > * The returned device has not had its ref count increased
> > > > * and the caller must therefore be careful about locking
> > > > *
> > > > + * Return: pointer to the net_device, or NULL if not found
> > > > */
> > >
> I am a bit confused about what you are saying.
> > > I noticed here we still mention RTNL and it should be removed.
>
> I have no mention RTNL in this patch at all:
Yes, and patch 2 removes the part from kernel-doc of
dev_getbyhwaddr_rcu().
>
> # git log -n1 --oneline HEAD~2
> 6d34fd4700231 net: document return value of dev_getbyhwaddr_rcu()
> # git show HEAD~2 | grep -i rtnl
>
> > I missed this part is removed in patch 2, but the Return: part
> > is still duplicate.
>
> This part is also unclear to me. What do you mean the "Return:" part is
> still duplicated?
>
> This is how the documentation looks like, after the patch applied:
>
> /**
> * dev_getbyhwaddr_rcu - find a device by its hardware address
> * @net: the applicable net namespace
> * @type: media type of device
> * @ha: hardware address
> *
> * Search for an interface by MAC address. Returns NULL if the device
^^^^^^^
Sorry, I meant this part is redundant as we have Return: now.
> * is not found or a pointer to the device.
> * The caller must hold RCU.
> * The returned device has not had its ref count increased
> * and the caller must therefore be careful about locking
> *
> * Return: pointer to the net_device, or NULL if not found
> */
> struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
> const char *ha)
> {
> <snip>
> }