[PATCH] uml: hot-unplug code cleanup

Clean up the hot-unplugging code.  There is now an id procedure which is
called to figure out what device we're talking to.  The error messages from
that are now done from mconsole_remove instead of the driver.  remove is now
called with the device number, after it has been checked, so doesn't need to
do sanity checking on it.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 21 insertions, 10 deletions

diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c
index 5388a742869..1495007bf6c 100644
--- a/arch/um/drivers/net_kern.c
+++ b/arch/um/drivers/net_kern.c
@@ -612,25 +612,35 @@ static int net_config(char *str)
         return(err);
 }
 
-static int net_remove(char *str)
+static int net_id(char **str, int *start_out, int *end_out)
+{
+        char *end;
+        int n;
+
+        n = simple_strtoul(*str, &end, 0);
+        if((*end != '\0') || (end == *str))
+                return -1;
+
+        *start_out = n;
+        *end_out = n;
+        *str = end;
+        return n;
+}
+
+static int net_remove(int n)
 {
         struct uml_net *device;
         struct net_device *dev;
         struct uml_net_private *lp;
-        char *end;
-        int n;
-
-        n = simple_strtoul(str, &end, 0);
-        if((*end != '\0') || (end == str))
-                return(-1);
 
         device = find_device(n);
         if(device == NULL)
-                return(0);
+                return -ENODEV;
 
         dev = device->dev;
         lp = dev->priv;
-        if(lp->fd > 0) return(-1);
+        if(lp->fd > 0)
+                return -EBUSY;
         if(lp->remove != NULL) (*lp->remove)(&lp->user);
         unregister_netdev(dev);
         platform_device_unregister(&device->pdev);
@@ -638,13 +648,14 @@ static int net_remove(char *str)
         list_del(&device->list);
         kfree(device);
         free_netdev(dev);
-        return(0);
+        return 0;
 }
 
 static struct mc_device net_mc = {
         .name           = "eth",
         .config         = net_config,
         .get_config     = NULL,
+        .id             = net_id,
         .remove         = net_remove,
 };