netdev - [PATCH v2 05/13] can: slcan: simplify the device de-allocation

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Date:   Wed,  8 Jun 2022 18:51:08 +0200
From:   Dario Binacchi <dario.binacchi@...rulasolutions.com>
To:     linux-kernel@...r.kernel.org
Cc:     Amarula patchwork <linux-amarula@...rulasolutions.com>,
        michael@...rulasolutions.com,
        Dario Binacchi <dario.binacchi@...rulasolutions.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Paolo Abeni <pabeni@...hat.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH v2 05/13] can: slcan: simplify the device de-allocation

Since slcan_devs array contains the addresses of the created devices, I
think it is more natural to use its address to remove it from the list.
It is not necessary to store the index of the array that points to the
device in the driver's private data.

Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
---

(no changes since v1)

 drivers/net/can/slcan.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/can/slcan.c b/drivers/net/can/slcan.c
index 929cb55e08af..cf05c30b8da5 100644
--- a/drivers/net/can/slcan.c
+++ b/drivers/net/can/slcan.c
@@ -432,11 +432,17 @@ static int slc_open(struct net_device *dev)
 
 static void slc_dealloc(struct slcan *sl)
 {
-	int i = sl->dev->base_addr;
+	unsigned int i;
 
-	free_candev(sl->dev);
-	if (slcan_devs)
-		slcan_devs[i] = NULL;
+	for (i = 0; i < maxdev; i++) {
+		if (sl->dev == slcan_devs[i]) {
+			free_candev(sl->dev);
+			slcan_devs[i] = NULL;
+			return;
+		}
+	}
+
+	pr_err("slcan: can't free %s resources\n",  sl->dev->name);
 }
 
 static int slcan_change_mtu(struct net_device *dev, int new_mtu)
@@ -533,7 +539,6 @@ static struct slcan *slc_alloc(void)
 
 	snprintf(dev->name, sizeof(dev->name), "slcan%d", i);
 	dev->netdev_ops = &slc_netdev_ops;
-	dev->base_addr  = i;
 	sl = netdev_priv(dev);
 
 	/* Initialize channel control data */
-- 
2.32.0