linux-kernel - [PATCH] net: usb: ax88179_178a: improve link status logs

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Message-ID: <20240617103405.654567-1-jtornosm@redhat.com>
Date: Mon, 17 Jun 2024 12:33:59 +0200
From: Jose Ignacio Tornos Martinez <jtornosm@...hat.com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	horms@...nel.org,
	linux-usb@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: jtornosm@...hat.com,
	stable@...r.kernel.org
Subject: [PATCH] net: usb: ax88179_178a: improve link status logs

Avoid spurious link status logs that may ultimately be wrong; for example,
if the link is set to down with the cable plugged, then the cable is
unplugged and afer this the link is set to up, the last new log that is
appearing is incorrectly telling that the link is up.

In order to aovid errors, show link status logs after link_reset
processing, and in order to avoid spurious as much as possible, only show
the link loss when some link status change is detected.

cc: stable@...r.kernel.org
Fixes: e2ca90c276e1 ("ax88179_178a: ASIX AX88179_178A USB 3.0/2.0 to gigabit ethernet adapter driver")
Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@...hat.com>
---
 drivers/net/usb/ax88179_178a.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c
index c2fb736f78b2..60357796be99 100644
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -326,7 +326,8 @@ static void ax88179_status(struct usbnet *dev, struct urb *urb)
 
 	if (netif_carrier_ok(dev->net) != link) {
 		usbnet_link_change(dev, link, 1);
-		netdev_info(dev->net, "ax88179 - Link status is: %d\n", link);
+		if (!link)
+			netdev_info(dev->net, "ax88179 - Link status is: %d\n", link);
 	}
 }
 
@@ -1542,6 +1543,7 @@ static int ax88179_link_reset(struct usbnet *dev)
 			 GMII_PHY_PHYSR, 2, &tmp16);
 
 	if (!(tmp16 & GMII_PHY_PHYSR_LINK)) {
+		netdev_info(dev->net, "ax88179 - Link status is: 0\n");
 		return 0;
 	} else if (GMII_PHY_PHYSR_GIGA == (tmp16 & GMII_PHY_PHYSR_SMASK)) {
 		mode |= AX_MEDIUM_GIGAMODE | AX_MEDIUM_EN_125MHZ;
@@ -1579,6 +1581,8 @@ static int ax88179_link_reset(struct usbnet *dev)
 
 	netif_carrier_on(dev->net);
 
+	netdev_info(dev->net, "ax88179 - Link status is: 1\n");
+
 	return 0;
 }
 
-- 
2.45.1