[PATCH] usbnet: Set duplex status to unknown in the absence of MII
From: <hidden>
Date: 2025-07-21 07:10:47
Also in:
linux-usb
Subsystem:
networking drivers, the rest, usb "usbnet" driver framework, usb networking drivers · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Oliver Neukum
From: Yi Cong <redacted> CDC device don't use mdio to get link status, duplex is set half as default. Now cdc_ncm can't get duplex, set it UNKNOWN instead of half which might actually be in an error state. Signed-off-by: Yi Cong <redacted> --- drivers/net/usb/usbnet.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 6a3cca104af9..c612f8f606e5 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c@@ -1013,6 +1013,11 @@ int usbnet_get_link_ksettings_internal(struct net_device *net, else cmd->base.speed = SPEED_UNKNOWN; + /* Now we can't get link duplex without MII, + * set it DUPLEX_UNKNOWN instead of default DUPLEX_HALF + */ + cmd->base.duplex = DUPLEX_UNKNOWN; + return 0; } EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_internal);
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2.25.1