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[PATCH] uml: balance list_add and list_del in the network driver

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The network driver added an interface to the "opened" list when it was
configured, not when it was brought up, and removed it when it was taken down.
 A sequence of ifconfig up, ifconfig down, ...  caused it to be removed
multiple times from the list without being added in between, resulting in a
crash.  This patch moves the add to when the interface is brought up.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jeff Dike 2006-02-07 12:58:42 -08:00 committed by Linus Torvalds
parent 1d2ddcfb19
commit 14d9ead05e
1 changed files with 19 additions and 10 deletions
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29
arch/um/drivers/net_kern.c
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@ -131,9 +131,8 @@ static int uml_net_open(struct net_device *dev)
SA_INTERRUPT | SA_SHIRQ, dev->name, dev);
if(err != 0){
printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
lp->fd = -1;
err = -ENETUNREACH;
goto out_close;
}
lp->tl.data = (unsigned long) &lp->user;
@ -145,9 +144,19 @@ static int uml_net_open(struct net_device *dev)
*/
while((err = uml_net_rx(dev)) > 0) ;
out:
spin_unlock(&lp->lock);
return(err);
spin_lock(&opened_lock);
list_add(&lp->list, &opened);
spin_unlock(&opened_lock);
return 0;
out_close:
if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
lp->fd = -1;
out:
spin_unlock(&lp->lock);
return err;
}
static int uml_net_close(struct net_device *dev)
@ -161,9 +170,13 @@ static int uml_net_close(struct net_device *dev)
if(lp->close != NULL)
(*lp->close)(lp->fd, &lp->user);
lp->fd = -1;
list_del(&lp->list);
spin_unlock(&lp->lock);
spin_lock(&opened_lock);
list_del(&lp->list);
spin_unlock(&opened_lock);
return 0;
}
@ -410,11 +423,7 @@ static int eth_configure(int n, void *init, char *mac,
if (device->have_mac)
set_ether_mac(dev, device->mac);
spin_lock(&opened_lock);
list_add(&lp->list, &opened);
spin_unlock(&opened_lock);
return(0);
return 0;
}
static struct uml_net *find_device(int n)