netdev - [PATCH] usbb: catc: use correct API for MAC addresses

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Date:   Mon, 25 Oct 2021 16:11:21 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     netdev@...r.kernel.org, linux-usb@...r.kernel.org,
        davem@...emloft.net, kuba@...nel.org
Cc:     Oliver Neukum <oneukum@...e.com>
Subject: [PATCH] usbb: catc: use correct API for MAC addresses

Commit 406f42fa0d3c ("net-next: When a bond have a massive amount
of VLANs...") introduced a rbtree for faster Ethernet address look
up. To maintain netdev->dev_addr in this tree we need to make all
the writes to it got through appropriate helpers.

In the case of catc we need a new temporary buffer to conform
to the rules for DMA coherency. That in turn necessitates
a reworking of error handling in probe().

Signed-off-by: Oliver Neukum <oneukum@...e.com>
---
 drivers/net/usb/catc.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/net/usb/catc.c b/drivers/net/usb/catc.c
index 24db5768a3c0..e7fe9c0f63a9 100644
--- a/drivers/net/usb/catc.c
+++ b/drivers/net/usb/catc.c
@@ -770,17 +770,23 @@ static int catc_probe(struct usb_interface *intf, const struct usb_device_id *id
 	struct net_device *netdev;
 	struct catc *catc;
 	u8 broadcast[ETH_ALEN];
-	int pktsz, ret;
+	u8 *macbuf;
+	int pktsz, ret = -ENOMEM;
+
+	macbuf = kmalloc(ETH_ALEN, GFP_KERNEL);
+	if (!macbuf)
+		goto error;
 
 	if (usb_set_interface(usbdev,
 			intf->altsetting->desc.bInterfaceNumber, 1)) {
 		dev_err(dev, "Can't set altsetting 1.\n");
-		return -EIO;
+		ret = -EIO;
+		goto fail_mem;;
 	}
 
 	netdev = alloc_etherdev(sizeof(struct catc));
 	if (!netdev)
-		return -ENOMEM;
+		goto fail_mem;
 
 	catc = netdev_priv(netdev);
 
@@ -870,7 +876,8 @@ static int catc_probe(struct usb_interface *intf, const struct usb_device_id *id
 	  
 		dev_dbg(dev, "Getting MAC from SEEROM.\n");
 	  
-		catc_get_mac(catc, netdev->dev_addr);
+		catc_get_mac(catc, macbuf);
+		eth_hw_addr_set(netdev, macbuf);
 		
 		dev_dbg(dev, "Setting MAC into registers.\n");
 	  
@@ -899,7 +906,8 @@ static int catc_probe(struct usb_interface *intf, const struct usb_device_id *id
 	} else {
 		dev_dbg(dev, "Performing reset\n");
 		catc_reset(catc);
-		catc_get_mac(catc, netdev->dev_addr);
+		catc_get_mac(catc, macbuf);
+		eth_hw_addr_set(netdev, macbuf);
 		
 		dev_dbg(dev, "Setting RX Mode\n");
 		catc->rxmode[0] = RxEnable | RxPolarity | RxMultiCast;
@@ -917,6 +925,7 @@ static int catc_probe(struct usb_interface *intf, const struct usb_device_id *id
 	if (ret)
 		goto fail_clear_intfdata;
 
+	kfree(macbuf);
 	return 0;
 
 fail_clear_intfdata:
@@ -927,6 +936,9 @@ static int catc_probe(struct usb_interface *intf, const struct usb_device_id *id
 	usb_free_urb(catc->rx_urb);
 	usb_free_urb(catc->irq_urb);
 	free_netdev(netdev);
+fail_mem:
+	kfree(macbuf);
+error:
 	return ret;
 }
 
-- 
2.26.2