linux-kernel - [PATCH 1/3] xtensa: iss/network: drop 'devices' list

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Date:   Thu,  7 Jul 2022 01:07:59 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     linux-xtensa@...ux-xtensa.org
Cc:     Chris Zankel <chris@...kel.net>, linux-kernel@...r.kernel.org,
        Yang Yingliang <yangyingliang@...wei.com>,
        Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH 1/3] xtensa: iss/network: drop 'devices' list

There are two per-device lists in the ISS network driver: command line
parameters list and iss_net_private object list. The latter is only used
for duplicate checking in the function iss_net_setup where the former
should have been used.
Drop iss_net_private object list and associated code and use command
line parameters list in the iss_net_setup instead.

Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
---
 arch/xtensa/platforms/iss/network.c | 21 +++------------------
 1 file changed, 3 insertions(+), 18 deletions(-)

diff --git a/arch/xtensa/platforms/iss/network.c b/arch/xtensa/platforms/iss/network.c
index fd84d4891758..2d566231688f 100644
--- a/arch/xtensa/platforms/iss/network.c
+++ b/arch/xtensa/platforms/iss/network.c
@@ -37,10 +37,6 @@
 #define ETH_HEADER_OTHER 14
 #define ISS_NET_TIMER_VALUE (HZ / 10)
 
-
-static DEFINE_SPINLOCK(devices_lock);
-static LIST_HEAD(devices);
-
 /* ------------------------------------------------------------------------- */
 
 /* We currently only support the TUNTAP transport protocol. */
@@ -70,8 +66,6 @@ struct iss_net_ops {
 /* This structure contains out private information for the driver. */
 
 struct iss_net_private {
-	struct list_head device_list;
-
 	spinlock_t lock;
 	struct net_device *dev;
 	struct platform_device pdev;
@@ -488,7 +482,6 @@ static int iss_net_configure(int index, char *init)
 
 	lp = netdev_priv(dev);
 	*lp = (struct iss_net_private) {
-		.device_list		= LIST_HEAD_INIT(lp->device_list),
 		.dev			= dev,
 		.index			= index,
 	};
@@ -521,10 +514,6 @@ static int iss_net_configure(int index, char *init)
 		driver_registered = 1;
 	}
 
-	spin_lock(&devices_lock);
-	list_add(&lp->device_list, &devices);
-	spin_unlock(&devices_lock);
-
 	lp->pdev.id = index;
 	lp->pdev.name = DRIVER_NAME;
 	platform_device_register(&lp->pdev);
@@ -574,7 +563,7 @@ struct iss_net_init {
 
 static int __init iss_net_setup(char *str)
 {
-	struct iss_net_private *device = NULL;
+	struct iss_net_init *device = NULL;
 	struct iss_net_init *new;
 	struct list_head *ele;
 	char *end;
@@ -595,16 +584,12 @@ static int __init iss_net_setup(char *str)
 	}
 	str = end;
 
-	spin_lock(&devices_lock);
-
-	list_for_each(ele, &devices) {
-		device = list_entry(ele, struct iss_net_private, device_list);
+	list_for_each(ele, &eth_cmd_line) {
+		device = list_entry(ele, struct iss_net_init, list);
 		if (device->index == n)
 			break;
 	}
 
-	spin_unlock(&devices_lock);
-
 	if (device && device->index == n) {
 		pr_err("Device %u already configured\n", n);
 		return 1;
-- 
2.30.2