sparse was unable to verify endiannes correctness due to reassignment from le32_to_cpu to the same variable - fix this warning up by providing a proper __le32 type and initializing it. This is not actually fixing any bug - rather just addressing the sparse warning.
Signed-off-by: Nicholas Mc Guire <[email protected]> --- Problem located by an experimental coccinelle script to locate patters that make sparse unhappy (false positives): V2: Reorder variables to preserve reverse christmas tree ordering as requested by David Miller <[email protected]>. sparse was unhappy about: net/qrtr/qrtr.c:811:24: warning: cast to restricted __le32 The patch does change the binary - from inspection of the .lst files it seems that the additional variable as well instruction reordering constraints change the code even if the code-logic is the same. Patch was compile-tested with: qcom_defconfig + QRTR=m (with some unrelated warnings about not implemented system calls) Patch is against 5.1 (localversion-next is next-20190510) net/qrtr/qrtr.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c index dd0e97f..801872a 100644 --- a/net/qrtr/qrtr.c +++ b/net/qrtr/qrtr.c @@ -728,12 +728,13 @@ static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name); int (*enqueue_fn)(struct qrtr_node *, struct sk_buff *, int, struct sockaddr_qrtr *, struct sockaddr_qrtr *); + __le32 qrtr_type = cpu_to_le32(QRTR_TYPE_DATA); struct qrtr_sock *ipc = qrtr_sk(sock->sk); struct sock *sk = sock->sk; struct qrtr_node *node; struct sk_buff *skb; + u32 type = 0; size_t plen; - u32 type = QRTR_TYPE_DATA; int rc; if (msg->msg_flags & ~(MSG_DONTWAIT)) @@ -807,8 +808,8 @@ static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) } /* control messages already require the type as 'command' */ - skb_copy_bits(skb, 0, &type, 4); - type = le32_to_cpu(type); + skb_copy_bits(skb, 0, &qrtr_type, 4); + type = le32_to_cpu(qrtr_type); } rc = enqueue_fn(node, skb, type, &ipc->us, addr); -- 2.1.4
