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Subject[PATCH net-next v4 9/9] net: dsa: microchip: do not reset the switch on shutdown if WoL is active
Date
For Wake on Lan we should not reconfigure, reset or power down the
switch on shut down sequence.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
drivers/net/dsa/microchip/ksz_common.c | 29 +++++++++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 85513318d165..abfd9dcab450 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -3565,6 +3565,33 @@ static int ksz_set_wol(struct dsa_switch *ds, int port,
return -EOPNOTSUPP;
}

+/**
+ * ksz_wol_is_active - Check if Wake-on-LAN is active on any port.
+ * @dev: The device structure.
+ *
+ * This function iterates through each user port on the switch, checking if
+ * Wake-on-LAN (WoL) is active on any of them.
+ *
+ * Return: true if WoL is active on any port, false otherwise.
+ */
+static bool ksz_wol_is_active(struct ksz_device *dev)
+{
+ struct dsa_port *dp;
+
+ if (!dev->wakeup_source)
+ return false;
+
+ dsa_switch_for_each_user_port(dp, dev->ds) {
+ struct ethtool_wolinfo wol;
+
+ ksz_get_wol(dev->ds, dp->index, &wol);
+ if (wol.wolopts)
+ return true;
+ }
+
+ return false;
+}
+
static int ksz_port_set_mac_address(struct dsa_switch *ds, int port,
const unsigned char *addr)
{
@@ -3822,7 +3849,7 @@ EXPORT_SYMBOL(ksz_switch_alloc);
*/
void ksz_switch_shutdown(struct ksz_device *dev)
{
- if (dev->dev_ops->reset)
+ if (dev->dev_ops->reset && !ksz_wol_is_active(dev))
dev->dev_ops->reset(dev);

dsa_switch_shutdown(dev->ds);
--
2.39.2
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