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Message-Id: <20220415122947.2754662-15-jakobkoschel@gmail.com> Date: Fri, 15 Apr 2022 14:29:43 +0200 From: Jakob Koschel <jakobkoschel@...il.com> To: "David S. Miller" <davem@...emloft.net> Cc: 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>, Vladimir Oltean <olteanv@...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>, Jakob Koschel <jakobkoschel@...il.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: [PATCH net-next v4 14/18] sfc: Remove usage of list iterator for list_add() after the loop body In preparation to limit the scope of a list iterator to the list traversal loop, use a dedicated pointer pointing to the location where the element should be inserted [1]. Before, the code implicitly used the head when no element was found when using &new->list. The new 'pos' variable is set to the list head by default and overwritten if the list exits early, marking the insertion point for list_add(). Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/ [1] Signed-off-by: Jakob Koschel <jakobkoschel@...il.com> --- drivers/net/ethernet/sfc/rx_common.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/sfc/rx_common.c b/drivers/net/ethernet/sfc/rx_common.c index 1b22c7be0088..716847ba7038 100644 --- a/drivers/net/ethernet/sfc/rx_common.c +++ b/drivers/net/ethernet/sfc/rx_common.c @@ -556,6 +556,7 @@ efx_rx_packet_gro(struct efx_channel *channel, struct efx_rx_buffer *rx_buf, struct efx_rss_context *efx_alloc_rss_context_entry(struct efx_nic *efx) { struct list_head *head = &efx->rss_context.list; + struct list_head *pos = head; struct efx_rss_context *ctx, *new; u32 id = 1; /* Don't use zero, that refers to the master RSS context */ @@ -563,8 +564,10 @@ struct efx_rss_context *efx_alloc_rss_context_entry(struct efx_nic *efx) /* Search for first gap in the numbering */ list_for_each_entry(ctx, head, list) { - if (ctx->user_id != id) + if (ctx->user_id != id) { + pos = &ctx->list; break; + } id++; /* Check for wrap. If this happens, we have nearly 2^32 * allocated RSS contexts, which seems unlikely. @@ -582,7 +585,7 @@ struct efx_rss_context *efx_alloc_rss_context_entry(struct efx_nic *efx) /* Insert the new entry into the gap */ new->user_id = id; - list_add_tail(&new->list, &ctx->list); + list_add_tail(&new->list, pos); return new; } -- 2.25.1
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