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authorDavid S. Miller <davem@davemloft.net>2014-03-03 16:05:04 -0500
committerDavid S. Miller <davem@davemloft.net>2014-03-03 16:05:04 -0500
commit82f1918351beb1b3d2ea7fa0bc842af04dc7e024 (patch)
tree0344d71ff90b168851a26c015a4a24cdb48c64fb /net
parent10ddceb22bab11dab10ba645c7df2e4a8e7a5db5 (diff)
parent821047c4055cca833c4674f172a9d73003563eb6 (diff)
Merge tag 'linux-can-fixes-for-3.14-20140303' of git://gitorious.org/linux-can/linux-can
linux-can-fixes-for-3.14-20140303 Marc Kleine-Budde says: ==================== this is a pull request of 8 patches. Oliver Hartkopp contributes a patch which removes the CAN FD compatibility for CAN 2.0 sockets, as it turns out that this compatibility has some conceptual cornercases. The remaining 7 patches are by me, they address a problem in the flexcan driver. When shutting down the interface ("ifconfig can0 down") under heavy network load the whole system will hang. This series reworks the actual sequence in close() and the transition from and to the low power modes of the CAN controller. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/can/raw.c26
1 files changed, 5 insertions, 21 deletions
diff --git a/net/can/raw.c b/net/can/raw.c
index 8be757cca2ec..081e81fd017f 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -121,13 +121,9 @@ static void raw_rcv(struct sk_buff *oskb, void *data)
if (!ro->recv_own_msgs && oskb->sk == sk)
return;
- /* do not pass frames with DLC > 8 to a legacy socket */
- if (!ro->fd_frames) {
- struct canfd_frame *cfd = (struct canfd_frame *)oskb->data;
-
- if (unlikely(cfd->len > CAN_MAX_DLEN))
- return;
- }
+ /* do not pass non-CAN2.0 frames to a legacy socket */
+ if (!ro->fd_frames && oskb->len != CAN_MTU)
+ return;
/* clone the given skb to be able to enqueue it into the rcv queue */
skb = skb_clone(oskb, GFP_ATOMIC);
@@ -738,9 +734,7 @@ static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size, int flags)
{
struct sock *sk = sock->sk;
- struct raw_sock *ro = raw_sk(sk);
struct sk_buff *skb;
- int rxmtu;
int err = 0;
int noblock;
@@ -751,20 +745,10 @@ static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
if (!skb)
return err;
- /*
- * when serving a legacy socket the DLC <= 8 is already checked inside
- * raw_rcv(). Now check if we need to pass a canfd_frame to a legacy
- * socket and cut the possible CANFD_MTU/CAN_MTU length to CAN_MTU
- */
- if (!ro->fd_frames)
- rxmtu = CAN_MTU;
- else
- rxmtu = skb->len;
-
- if (size < rxmtu)
+ if (size < skb->len)
msg->msg_flags |= MSG_TRUNC;
else
- size = rxmtu;
+ size = skb->len;
err = memcpy_toiovec(msg->msg_iov, skb->data, size);
if (err < 0) {