[PATCH net-next v3 06/31] phonet: use siocdevprivate

Arnd Bergmann
2021-07-27T13:46:43Z

phonet has a single private ioctl that is broken in compat
mode on big-endian machines today because the data returned
from it is never copied back to user space.

Move it over to the ndo_siocdevprivate callback, which also
fixes the compat issue.

Cc: Remi Denis-Courmont <courmisch@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/net/usb/cdc-phonet.c | 5 +++--
net/phonet/pn_dev.c | 6 +++---
2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/net/usb/cdc-phonet.c b/drivers/net/usb/cdc-phonet.c
index 8d1f69dad603..e1da9102a540 100644
--- a/drivers/net/usb/cdc-phonet.c
+++ b/drivers/net/usb/cdc-phonet.c
@@ -253,7 +253,8 @@ static int usbpn_close(struct net_device *dev)
return usb_set_interface(pnd->usb, num, !pnd->active_setting);
}

-static int usbpn_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+static int usbpn_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
+ void __user *data, int cmd)
{
struct if_phonet_req *req = (struct if_phonet_req *)ifr;

@@ -269,7 +270,7 @@ static const struct net_device_ops usbpn_ops = {
.ndo_open = usbpn_open,
.ndo_stop = usbpn_close,
.ndo_start_xmit = usbpn_xmit,
- .ndo_do_ioctl = usbpn_ioctl,
+ .ndo_siocdevprivate = usbpn_siocdevprivate,
};

static void usbpn_setup(struct net_device *dev)
diff --git a/net/phonet/pn_dev.c b/net/phonet/pn_dev.c
index ac0fae06cc15..876d0ae5f9fd 100644
--- a/net/phonet/pn_dev.c
+++ b/net/phonet/pn_dev.c
@@ -233,11 +233,11 @@ static int phonet_device_autoconf(struct net_device *dev)
struct if_phonet_req req;
int ret;

- if (!dev->netdev_ops->ndo_do_ioctl)
+ if (!dev->netdev_ops->ndo_siocdevprivate)
return -EOPNOTSUPP;

- ret = dev->netdev_ops->ndo_do_ioctl(dev, (struct ifreq *)&req,
- SIOCPNGAUTOCONF);
+ ret = dev->netdev_ops->ndo_siocdevprivate(dev, (struct ifreq *)&req,
+ NULL, SIOCPNGAUTOCONF);
if (ret < 0)
return ret;

--
2.29.2