[PATCH] uml: multicast driver cleanup
Byte-swapping of the port and IP address passed in to the multicast driver by
the user used to happen in different places, which was a bug in itself. The
port also was swapped before being printk-ed, which led to a misleading
message. This patch moves the port swapping to the same place as the IP
address swapping. It also cleans up the error paths of mcast_open.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/um/drivers/mcast_user.c b/arch/um/drivers/mcast_user.c
index 0fe1d9f..7a0d115 100644
--- a/arch/um/drivers/mcast_user.c
+++ b/arch/um/drivers/mcast_user.c
@@ -38,7 +38,7 @@
}
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = in_aton(addr);
- sin->sin_port = port;
+ sin->sin_port = htons(port);
return(sin);
}
@@ -55,28 +55,25 @@
struct mcast_data *pri = data;
struct sockaddr_in *sin = pri->mcast_addr;
struct ip_mreq mreq;
- int fd, yes = 1;
+ int fd = -EINVAL, yes = 1, err = -EINVAL;;
- if ((sin->sin_addr.s_addr == 0) || (sin->sin_port == 0)) {
- fd = -EINVAL;
+ if ((sin->sin_addr.s_addr == 0) || (sin->sin_port == 0))
goto out;
- }
fd = socket(AF_INET, SOCK_DGRAM, 0);
+
if (fd < 0){
printk("mcast_open : data socket failed, errno = %d\n",
errno);
- fd = -ENOMEM;
+ fd = -errno;
goto out;
}
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
printk("mcast_open: SO_REUSEADDR failed, errno = %d\n",
errno);
- os_close_file(fd);
- fd = -EINVAL;
- goto out;
+ goto out_close;
}
/* set ttl according to config */
@@ -84,26 +81,20 @@
sizeof(pri->ttl)) < 0) {
printk("mcast_open: IP_MULTICAST_TTL failed, error = %d\n",
errno);
- os_close_file(fd);
- fd = -EINVAL;
- goto out;
+ goto out_close;
}
/* set LOOP, so data does get fed back to local sockets */
if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP, &yes, sizeof(yes)) < 0) {
printk("mcast_open: IP_MULTICAST_LOOP failed, error = %d\n",
errno);
- os_close_file(fd);
- fd = -EINVAL;
- goto out;
+ goto out_close;
}
/* bind socket to mcast address */
if (bind(fd, (struct sockaddr *) sin, sizeof(*sin)) < 0) {
printk("mcast_open : data bind failed, errno = %d\n", errno);
- os_close_file(fd);
- fd = -EINVAL;
- goto out;
+ goto out_close;
}
/* subscribe to the multicast group */
@@ -117,12 +108,15 @@
"interface on the host.\n");
printk("eth0 should be configured in order to use the "
"multicast transport.\n");
- os_close_file(fd);
- fd = -EINVAL;
+ goto out_close;
}
out:
- return(fd);
+ return fd;
+
+ out_close:
+ os_close_file(fd);
+ return err;
}
static void mcast_close(int fd, void *data)
@@ -164,14 +158,3 @@
.delete_address = NULL,
.max_packet = MAX_PACKET - ETH_HEADER_OTHER
};
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */