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Message-ID: <20220415160452.z4m4j3sulcteqggs@skbuf> Date: Fri, 15 Apr 2022 19:04:52 +0300 From: Vladimir Oltean <olteanv@...il.com> To: Jakob Koschel <jakobkoschel@...il.com> Cc: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>, Vivien Didelot <vivien.didelot@...il.com>, Florian Fainelli <f.fainelli@...il.com>, Lars Povlsen <lars.povlsen@...rochip.com>, Steen Hegelund <Steen.Hegelund@...rochip.com>, UNGLinuxDriver@...rochip.com, Ariel Elior <aelior@...vell.com>, Manish Chopra <manishc@...vell.com>, Edward Cree <ecree.xilinx@...il.com>, Martin Habets <habetsm.xilinx@...il.com>, Michael Ellerman <mpe@...erman.id.au>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org>, Jiri Pirko <jiri@...nulli.us>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau <kafai@...com>, Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>, John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, Casper Andersson <casper.casan@...il.com>, Bjarni Jonasson <bjarni.jonasson@...rochip.com>, Christophe JAILLET <christophe.jaillet@...adoo.fr>, Arnd Bergmann <arnd@...db.de>, Colin Ian King <colin.king@...el.com>, Eric Dumazet <edumazet@...gle.com>, Xu Wang <vulab@...as.ac.cn>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org, bpf@...r.kernel.org, Mike Rapoport <rppt@...nel.org>, Brian Johannesmeyer <bjohannesmeyer@...il.com>, Cristiano Giuffrida <c.giuffrida@...nl>, "Bos, H.J." <h.j.bos@...nl> Subject: Re: [PATCH net-next v4 07/18] net: dsa: Replace usage of found with dedicated list iterator variable On Fri, Apr 15, 2022 at 02:29:36PM +0200, Jakob Koschel wrote: > To move the list iterator variable into the list_for_each_entry_*() > macro in the future it should be avoided to use the list iterator > variable after the loop body. > > To *never* use the list iterator variable after the loop it was > concluded to use a separate iterator variable instead of a > found boolean [1]. > > This removes the need to use a found variable and simply checking if > the variable was set, can determine if the break/goto was hit. > > Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/ [1] > Signed-off-by: Jakob Koschel <jakobkoschel@...il.com> > --- I absolutely hate the robotic commit message, but the change looks like it works, so: Reviewed-by: Vladimir Oltean <olteanv@...il.com> > net/dsa/dsa.c | 11 +++++------ > 1 file changed, 5 insertions(+), 6 deletions(-) > > diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c > index 89c6c86e746f..645522c4dd4a 100644 > --- a/net/dsa/dsa.c > +++ b/net/dsa/dsa.c > @@ -112,22 +112,21 @@ const struct dsa_device_ops *dsa_find_tagger_by_name(const char *buf) > > const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol) > { > - struct dsa_tag_driver *dsa_tag_driver; > + struct dsa_tag_driver *dsa_tag_driver = NULL, *iter; > const struct dsa_device_ops *ops; > - bool found = false; > > request_module("%s%d", DSA_TAG_DRIVER_ALIAS, tag_protocol); > > mutex_lock(&dsa_tag_drivers_lock); > - list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) { > - ops = dsa_tag_driver->ops; > + list_for_each_entry(iter, &dsa_tag_drivers_list, list) { > + ops = iter->ops; > if (ops->proto == tag_protocol) { > - found = true; > + dsa_tag_driver = iter; > break; > } > } > > - if (found) { > + if (dsa_tag_driver) { > if (!try_module_get(dsa_tag_driver->owner)) > ops = ERR_PTR(-ENOPROTOOPT); > } else { > -- > 2.25.1 >
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