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Message-Id: <20220407102900.3086255-13-jakobkoschel@gmail.com>
Date: Thu, 7 Apr 2022 12:28:57 +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>,
Casper Andersson <casper.casan@...il.com>,
Bjarni Jonasson <bjarni.jonasson@...rochip.com>,
Jakob Koschel <jakobkoschel@...il.com>,
Colin Ian King <colin.king@...el.com>,
Michael Walle <michael@...le.cc>,
Christophe JAILLET <christophe.jaillet@...adoo.fr>,
Arnd Bergmann <arnd@...db.de>,
Eric Dumazet <edumazet@...gle.com>,
Di Zhu <zhudi21@...wei.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, 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 12/15] net: netcp: Remove usage of list iterator for list_add() after loop body
In preparation to limit the scope of a list iterator to the list
traversal loop, use a dedicated pointer to point to the found element [1].
Before, the code implicitly used the head when no element was found
when using &pos->list. Since the new variable is only set if an
element was found, the list_add() is performed within the loop
and only done after the loop if it is done on the list head directly.
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/ti/netcp_core.c | 24 ++++++++++++++++--------
1 file changed, 16 insertions(+), 8 deletions(-)
diff --git a/drivers/net/ethernet/ti/netcp_core.c b/drivers/net/ethernet/ti/netcp_core.c
index 16507bff652a..7f89fd82ecc8 100644
--- a/drivers/net/ethernet/ti/netcp_core.c
+++ b/drivers/net/ethernet/ti/netcp_core.c
@@ -471,8 +471,8 @@ struct netcp_hook_list {
int netcp_register_txhook(struct netcp_intf *netcp_priv, int order,
netcp_hook_rtn *hook_rtn, void *hook_data)
{
+ struct netcp_hook_list *next = NULL, *iter;
struct netcp_hook_list *entry;
- struct netcp_hook_list *next;
unsigned long flags;
entry = devm_kzalloc(netcp_priv->dev, sizeof(*entry), GFP_KERNEL);
@@ -484,11 +484,15 @@ int netcp_register_txhook(struct netcp_intf *netcp_priv, int order,
entry->order = order;
spin_lock_irqsave(&netcp_priv->lock, flags);
- list_for_each_entry(next, &netcp_priv->txhook_list_head, list) {
- if (next->order > order)
+ list_for_each_entry(iter, &netcp_priv->txhook_list_head, list) {
+ if (iter->order > order) {
+ next = iter;
+ list_add_tail(&entry->list, &iter->list);
break;
+ }
}
- __list_add(&entry->list, next->list.prev, &next->list);
+ if (!next)
+ list_add_tail(&entry->list, &netcp_priv->txhook_list_head);
spin_unlock_irqrestore(&netcp_priv->lock, flags);
return 0;
@@ -520,8 +524,8 @@ EXPORT_SYMBOL_GPL(netcp_unregister_txhook);
int netcp_register_rxhook(struct netcp_intf *netcp_priv, int order,
netcp_hook_rtn *hook_rtn, void *hook_data)
{
+ struct netcp_hook_list *next = NULL, *iter;
struct netcp_hook_list *entry;
- struct netcp_hook_list *next;
unsigned long flags;
entry = devm_kzalloc(netcp_priv->dev, sizeof(*entry), GFP_KERNEL);
@@ -533,11 +537,15 @@ int netcp_register_rxhook(struct netcp_intf *netcp_priv, int order,
entry->order = order;
spin_lock_irqsave(&netcp_priv->lock, flags);
- list_for_each_entry(next, &netcp_priv->rxhook_list_head, list) {
- if (next->order > order)
+ list_for_each_entry(iter, &netcp_priv->rxhook_list_head, list) {
+ if (iter->order > order) {
+ next = iter;
+ list_add_tail(&entry->list, &iter->list);
break;
+ }
}
- __list_add(&entry->list, next->list.prev, &next->list);
+ if (!next)
+ list_add_tail(&entry->list, &netcp_priv->rxhook_list_head);
spin_unlock_irqrestore(&netcp_priv->lock, flags);
return 0;
--
2.25.1
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