[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_kern.c b/arch/um/drivers/mcast_kern.c
index faf714e..217438c 100644 (file)
--- a/arch/um/drivers/mcast_kern.c
+++ b/arch/um/drivers/mcast_kern.c
@@ -73,7 +73,6 @@ int mcast_setup(char *str, char **mac_out, void *data)
        struct mcast_init *init = data;
        char *port_str = NULL, *ttl_str = NULL, *remain;
        char *last;
-       int n;
 
        *init = ((struct mcast_init)
                { .addr         = "239.192.168.1",
@@ -89,13 +88,12 @@ int mcast_setup(char *str, char **mac_out, void *data)
        }
        
        if(port_str != NULL){
-               n = simple_strtoul(port_str, &last, 10);
+               init->port = simple_strtoul(port_str, &last, 10);
                if((*last != '\0') || (last == port_str)){
                        printk(KERN_ERR "mcast_setup - Bad port : '%s'\n", 
                               port_str);
                        return(0);
                }
-               init->port = htons(n);
        }
 
        if(ttl_str != NULL){

diff --git a/arch/um/drivers/mcast_user.c b/arch/um/drivers/mcast_user.c
index 0fe1d9f..7a0d115 100644 (file)
--- a/arch/um/drivers/mcast_user.c
+++ b/arch/um/drivers/mcast_user.c
@@ -38,7 +38,7 @@ static struct sockaddr_in *new_addr(char *addr, unsigned short port)
        }
        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 @@ static int mcast_open(void *data)
        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 @@ static int mcast_open(void *data)
                       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 @@ static int mcast_open(void *data)
                       "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 @@ struct net_user_info mcast_user_info = {
        .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:
- */