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From: Jose Ignacio Tornos Martinez <jtornosm@redhat.com>
To: davem@davemloft.net,
	edumazet@google.com,
	kuba@kernel.org,
	pabeni@redhat.com,
	linux-usb@vger.kernel.org,
	netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: Jose Ignacio Tornos Martinez <jtornosm@redhat.com>,
	stable@vger.kernel.org,
	Isaac Ganoung <inventor500@vivaldi.net>,
	Yongqin Liu <yongqin.liu@linaro.org>
Subject: [PATCH] net: usb: ax88179_178a: fix link status when link is set to down/up
Date: Fri, 10 May 2024 11:08:28 +0200
Message-ID: <20240510090846.328201-1-jtornosm@redhat.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

The idea was to keep only one reset at initialization stage in order to
reduce the total delay, or the reset from usbnet_probe or the reset from
usbnet_open.

I have seen that restarting from usbnet_probe is necessary to avoid doing
too complex things. But when the link is set to down/up (for example to
configure a different mac address) the link is not correctly recovered
unless a reset is commanded from usbnet_open.

So, detect the initialization stage (first call) to not reset from
usbnet_open after the reset from usbnet_probe and after this stage, always
reset from usbnet_open too (when the link needs to be rechecked).

Apply to all the possible devices, the behavior now is going to be the same.

cc: stable@vger.kernel.org # 6.6+
Fixes: 56f78615bcb1 ("net: usb: ax88179_178a: avoid writing the mac address before first reading")
Reported-by: Isaac Ganoung <inventor500@vivaldi.net>
Reported-by: Yongqin Liu <yongqin.liu@linaro.org>
Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@redhat.com>
---
 drivers/net/usb/ax88179_178a.c | 37 ++++++++++++++++++++++++----------
 1 file changed, 26 insertions(+), 11 deletions(-)

diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c
index 377be0d9ef14..a0edb410f746 100644
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -174,6 +174,7 @@ struct ax88179_data {
 	u32 wol_supported;
 	u32 wolopts;
 	u8 disconnecting;
+	u8 initialized;
 };
 
 struct ax88179_int_data {
@@ -1672,6 +1673,18 @@ static int ax88179_reset(struct usbnet *dev)
 	return 0;
 }
 
+static int ax88179_net_reset(struct usbnet *dev)
+{
+	struct ax88179_data *ax179_data = dev->driver_priv;
+
+	if (ax179_data->initialized)
+		ax88179_reset(dev);
+	else
+		ax179_data->initialized = 1;
+
+	return 0;
+}
+
 static int ax88179_stop(struct usbnet *dev)
 {
 	u16 tmp16;
@@ -1691,6 +1704,7 @@ static const struct driver_info ax88179_info = {
 	.unbind = ax88179_unbind,
 	.status = ax88179_status,
 	.link_reset = ax88179_link_reset,
+	.reset = ax88179_net_reset,
 	.stop = ax88179_stop,
 	.flags = FLAG_ETHER | FLAG_FRAMING_AX,
 	.rx_fixup = ax88179_rx_fixup,
@@ -1703,6 +1717,7 @@ static const struct driver_info ax88178a_info = {
 	.unbind = ax88179_unbind,
 	.status = ax88179_status,
 	.link_reset = ax88179_link_reset,
+	.reset = ax88179_net_reset,
 	.stop = ax88179_stop,
 	.flags = FLAG_ETHER | FLAG_FRAMING_AX,
 	.rx_fixup = ax88179_rx_fixup,
@@ -1715,7 +1730,7 @@ static const struct driver_info cypress_GX3_info = {
 	.unbind = ax88179_unbind,
 	.status = ax88179_status,
 	.link_reset = ax88179_link_reset,
-	.reset = ax88179_reset,
+	.reset = ax88179_net_reset,
 	.stop = ax88179_stop,
 	.flags = FLAG_ETHER | FLAG_FRAMING_AX,
 	.rx_fixup = ax88179_rx_fixup,
@@ -1728,7 +1743,7 @@ static const struct driver_info dlink_dub1312_info = {
 	.unbind = ax88179_unbind,
 	.status = ax88179_status,
 	.link_reset = ax88179_link_reset,
-	.reset = ax88179_reset,
+	.reset = ax88179_net_reset,
 	.stop = ax88179_stop,
 	.flags = FLAG_ETHER | FLAG_FRAMING_AX,
 	.rx_fixup = ax88179_rx_fixup,
@@ -1741,7 +1756,7 @@ static const struct driver_info sitecom_info = {
 	.unbind = ax88179_unbind,
 	.status = ax88179_status,
 	.link_reset = ax88179_link_reset,
-	.reset = ax88179_reset,
+	.reset = ax88179_net_reset,
 	.stop = ax88179_stop,
 	.flags = FLAG_ETHER | FLAG_FRAMING_AX,
 	.rx_fixup = ax88179_rx_fixup,
@@ -1754,7 +1769,7 @@ static const struct driver_info samsung_info = {
 	.unbind = ax88179_unbind,
 	.status = ax88179_status,
 	.link_reset = ax88179_link_reset,
-	.reset = ax88179_reset,
+	.reset = ax88179_net_reset,
 	.stop = ax88179_stop,
 	.flags = FLAG_ETHER | FLAG_FRAMING_AX,
 	.rx_fixup = ax88179_rx_fixup,
@@ -1767,7 +1782,7 @@ static const struct driver_info lenovo_info = {
 	.unbind = ax88179_unbind,
 	.status = ax88179_status,
 	.link_reset = ax88179_link_reset,
-	.reset = ax88179_reset,
+	.reset = ax88179_net_reset,
 	.stop = ax88179_stop,
 	.flags = FLAG_ETHER | FLAG_FRAMING_AX,
 	.rx_fixup = ax88179_rx_fixup,
@@ -1780,7 +1795,7 @@ static const struct driver_info belkin_info = {
 	.unbind = ax88179_unbind,
 	.status = ax88179_status,
 	.link_reset = ax88179_link_reset,
-	.reset	= ax88179_reset,
+	.reset	= ax88179_net_reset,
 	.stop	= ax88179_stop,
 	.flags	= FLAG_ETHER | FLAG_FRAMING_AX,
 	.rx_fixup = ax88179_rx_fixup,
@@ -1793,7 +1808,7 @@ static const struct driver_info toshiba_info = {
 	.unbind = ax88179_unbind,
 	.status = ax88179_status,
 	.link_reset = ax88179_link_reset,
-	.reset	= ax88179_reset,
+	.reset	= ax88179_net_reset,
 	.stop = ax88179_stop,
 	.flags	= FLAG_ETHER | FLAG_FRAMING_AX,
 	.rx_fixup = ax88179_rx_fixup,
@@ -1806,7 +1821,7 @@ static const struct driver_info mct_info = {
 	.unbind	= ax88179_unbind,
 	.status	= ax88179_status,
 	.link_reset = ax88179_link_reset,
-	.reset	= ax88179_reset,
+	.reset	= ax88179_net_reset,
 	.stop	= ax88179_stop,
 	.flags	= FLAG_ETHER | FLAG_FRAMING_AX,
 	.rx_fixup = ax88179_rx_fixup,
@@ -1819,7 +1834,7 @@ static const struct driver_info at_umc2000_info = {
 	.unbind = ax88179_unbind,
 	.status = ax88179_status,
 	.link_reset = ax88179_link_reset,
-	.reset  = ax88179_reset,
+	.reset  = ax88179_net_reset,
 	.stop   = ax88179_stop,
 	.flags  = FLAG_ETHER | FLAG_FRAMING_AX,
 	.rx_fixup = ax88179_rx_fixup,
@@ -1832,7 +1847,7 @@ static const struct driver_info at_umc200_info = {
 	.unbind = ax88179_unbind,
 	.status = ax88179_status,
 	.link_reset = ax88179_link_reset,
-	.reset  = ax88179_reset,
+	.reset  = ax88179_net_reset,
 	.stop   = ax88179_stop,
 	.flags  = FLAG_ETHER | FLAG_FRAMING_AX,
 	.rx_fixup = ax88179_rx_fixup,
@@ -1845,7 +1860,7 @@ static const struct driver_info at_umc2000sp_info = {
 	.unbind = ax88179_unbind,
 	.status = ax88179_status,
 	.link_reset = ax88179_link_reset,
-	.reset  = ax88179_reset,
+	.reset  = ax88179_net_reset,
 	.stop   = ax88179_stop,
 	.flags  = FLAG_ETHER | FLAG_FRAMING_AX,
 	.rx_fixup = ax88179_rx_fixup,
-- 
2.44.0