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can: gs_usb: gs_usb_set_phys_id(): return with error if identify is not supported 

Until commit 409c188c57 ("can: tree-wide: advertise software
timestamping capabilities") the ethtool_ops was only assigned for
devices which support the GS_CAN_FEATURE_IDENTIFY feature. That commit
assigns ethtool_ops unconditionally.

This results on controllers without GS_CAN_FEATURE_IDENTIFY support
for the following ethtool error:

| $ ethtool -p can0 1
| Cannot identify NIC: Broken pipe

Restore the correct error value by checking for
GS_CAN_FEATURE_IDENTIFY in the gs_usb_set_phys_id() function.

| $ ethtool -p can0 1
| Cannot identify NIC: Operation not supported

While there use the variable "netdev" for the "struct net_device"
pointer and "dev" for the "struct gs_can" pointer as in the rest of
the driver.

Fixes: 409c188c57 ("can: tree-wide: advertise software timestamping capabilities")
Link: http://lore.kernel.org/all/20220818143853.2671854-1-mkl@pengutronix.de
Cc: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2022-08-18 14:10:08 +02:00
parent 5440428b3d
commit 0f2211f1cf
1 changed files with 11 additions and 6 deletions
drivers/net/can/usb
gs_usb.c

17
drivers/net/can/usb/gs_usb.c
View File

@ -925,17 +925,21 @@ static int gs_usb_set_identify(struct net_device *netdev, bool do_identify)
}
/* blink LED's for finding the this interface */
static int gs_usb_set_phys_id(struct net_device *dev,
static int gs_usb_set_phys_id(struct net_device *netdev,
enum ethtool_phys_id_state state)
{
const struct gs_can *dev = netdev_priv(netdev);
int rc = 0;
if (!(dev->feature & GS_CAN_FEATURE_IDENTIFY))
return -EOPNOTSUPP;
switch (state) {
case ETHTOOL_ID_ACTIVE:
rc = gs_usb_set_identify(dev, GS_CAN_IDENTIFY_ON);
rc = gs_usb_set_identify(netdev, GS_CAN_IDENTIFY_ON);
break;
case ETHTOOL_ID_INACTIVE:
rc = gs_usb_set_identify(dev, GS_CAN_IDENTIFY_OFF);
rc = gs_usb_set_identify(netdev, GS_CAN_IDENTIFY_OFF);
break;
default:
break;
@ -1072,9 +1076,10 @@ static struct gs_can *gs_make_candev(unsigned int channel,
dev->feature |= GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX |
GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO;
if (le32_to_cpu(dconf->sw_version) > 1)
if (feature & GS_CAN_FEATURE_IDENTIFY)
netdev->ethtool_ops = &gs_usb_ethtool_ops;
/* GS_CAN_FEATURE_IDENTIFY is only supported for sw_version > 1 */
if (!(le32_to_cpu(dconf->sw_version) > 1 &&
feature & GS_CAN_FEATURE_IDENTIFY))
dev->feature &= ~GS_CAN_FEATURE_IDENTIFY;
kfree(bt_const);