From 14d9ead05ec925f299ae5cfe948c180c88ec842e Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Tue, 7 Feb 2006 12:58:42 -0800 Subject: [PATCH] [PATCH] uml: balance list_add and list_del in the network driver 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 Cc: Paolo 'Blaisorblade' Giarrusso Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/drivers/net_kern.c | 29 +++++++++++++++++++---------- 1 file changed, 19 insertions(+), 10 deletions(-) diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c index 8ebb2241ad4..8c7279bb353 100644 --- a/arch/um/drivers/net_kern.c +++ b/arch/um/drivers/net_kern.c @@ -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) -- 2.20.1