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Date: Fri, 10 May 2019 03:08:53 +0200 From: Nicholas Mc Guire <hofrat@...dl.org> To: "David S. Miller" <davem@...emloft.net> Cc: Arun Kumar Neelakantam <aneela@...eaurora.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Anshuman Khandual <anshuman.khandual@....com>, David Hildenbrand <david@...hat.com>, Arnd Bergmann <arnd@...db.de>, Johannes Berg <johannes.berg@...el.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Nicholas Mc Guire <hofrat@...dl.org> Subject: [PATCH] net: qrtr: use protocol endiannes variable sparse was unable to verify endianness 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 <hofrat@...dl.org> --- Problem located by an experimental coccinelle script to locate patters that make sparse unhappy (false positives): 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 Patch is against 5.1 (localversion-next is next-20190509) 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..c90edaa 100644 --- a/net/qrtr/qrtr.c +++ b/net/qrtr/qrtr.c @@ -733,7 +733,8 @@ static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) struct qrtr_node *node; struct sk_buff *skb; size_t plen; - u32 type = QRTR_TYPE_DATA; + u32 type = 0; + __le32 qrtr_type = cpu_to_le32(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
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