From: Oliver Hartkopp <socketcan@hartkopp.net>
Date: Mon, 29 Jul 2019 20:40:56 +0000 (+0200)
Subject: can: fix ioctl function removal
X-Git-Tag: v5.4-rc1~131^2~336
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=473d924d7d46cb57aa4c1863261d18366af345af;p=platform%2Fkernel%2Flinux-rpi.git

can: fix ioctl function removal

Commit 60649d4e0af ("can: remove obsolete empty ioctl() handler") replaced the
almost empty can_ioctl() function with sock_no_ioctl() which always returns
-EOPNOTSUPP.

Even though we don't have any ioctl() functions on socket/network layer we need
to return -ENOIOCTLCMD to be able to forward ioctl commands like SIOCGIFINDEX
to the network driver layer.

This patch fixes the wrong return codes in the CAN network layer protocols.

Reported-by: kernel test robot <rong.a.chen@intel.com>
Fixes: 60649d4e0af ("can: remove obsolete empty ioctl() handler")
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/can/bcm.c b/net/can/bcm.c
index 8da986b..bf1d0bb 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -1680,6 +1680,13 @@ static int bcm_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 	return size;
 }
 
+int bcm_sock_no_ioctlcmd(struct socket *sock, unsigned int cmd,
+			 unsigned long arg)
+{
+	/* no ioctls for socket layer -> hand it down to NIC layer */
+	return -ENOIOCTLCMD;
+}
+
 static const struct proto_ops bcm_ops = {
 	.family        = PF_CAN,
 	.release       = bcm_release,
@@ -1689,7 +1696,7 @@ static const struct proto_ops bcm_ops = {
 	.accept        = sock_no_accept,
 	.getname       = sock_no_getname,
 	.poll          = datagram_poll,
-	.ioctl         = sock_no_ioctl,
+	.ioctl         = bcm_sock_no_ioctlcmd,
 	.gettstamp     = sock_gettstamp,
 	.listen        = sock_no_listen,
 	.shutdown      = sock_no_shutdown,
diff --git a/net/can/raw.c b/net/can/raw.c
index ff72027..da386f1 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -837,6 +837,13 @@ static int raw_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 	return size;
 }
 
+int raw_sock_no_ioctlcmd(struct socket *sock, unsigned int cmd,
+			 unsigned long arg)
+{
+	/* no ioctls for socket layer -> hand it down to NIC layer */
+	return -ENOIOCTLCMD;
+}
+
 static const struct proto_ops raw_ops = {
 	.family        = PF_CAN,
 	.release       = raw_release,
@@ -846,7 +853,7 @@ static const struct proto_ops raw_ops = {
 	.accept        = sock_no_accept,
 	.getname       = raw_getname,
 	.poll          = datagram_poll,
-	.ioctl         = sock_no_ioctl,
+	.ioctl         = raw_sock_no_ioctlcmd,
 	.gettstamp     = sock_gettstamp,
 	.listen        = sock_no_listen,
 	.shutdown      = sock_no_shutdown,