netdev - [PATCH net-next v2 1/1] driver: tun: Use new macro SOCK_IOC

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Message-Id: <1477530322-29021-1-git-send-email-fgao@ikuai8.com>
Date:   Thu, 27 Oct 2016 09:05:22 +0800
From:   fgao@...ai8.com
To:     davem@...emloft.net, jasowang@...hat.com, edumazet@...gle.com,
        pabeni@...hat.com, netdev@...r.kernel.org
Cc:     gfree.wind@...il.com, Gao Feng <fgao@...ai8.com>
Subject: [PATCH net-next v2 1/1] driver: tun: Use new macro SOCK_IOC_TYPE instead of literal number 0x89

From: Gao Feng <fgao@...ai8.com>

The current codes use _IOC_TYPE(cmd) == 0x89 to check if the cmd is one
socket ioctl command like SIOCGIFHWADDR. But the literal number 0x89 may
confuse readers. So create one macro SOCK_IOC_TYPE to enhance the readability.

Signed-off-by: Gao Feng <fgao@...ai8.com>
---
 v2: Rename the macro SOCK_IOC_MAGIC to SOCK_IOC_TYPE
 v1: Initial version

 drivers/net/tun.c            | 2 +-
 include/uapi/linux/sockios.h | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 9328568..bb49ccb 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1985,7 +1985,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
 	int le;
 	int ret;
 
-	if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == 0x89) {
+	if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == SOCK_IOC_TYPE) {
 		if (copy_from_user(&ifr, argp, ifreq_len))
 			return -EFAULT;
 	} else {
diff --git a/include/uapi/linux/sockios.h b/include/uapi/linux/sockios.h
index 8e7890b..c977d0e 100644
--- a/include/uapi/linux/sockios.h
+++ b/include/uapi/linux/sockios.h
@@ -24,6 +24,8 @@
 #define SIOCINQ		FIONREAD
 #define SIOCOUTQ	TIOCOUTQ        /* output queue size (not sent + not acked) */
 
+#define SOCK_IOC_TYPE	0x89
+
 /* Routing table calls. */
 #define SIOCADDRT	0x890B		/* add routing table entry	*/
 #define SIOCDELRT	0x890C		/* delete routing table entry	*/
-- 
1.9.1