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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2006-12-13 00:33:50 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-13 09:05:47 -0800 |
| commit | eff3b634d9a0cccb6ca8b431819fa415f10804dc (patch) | |
| tree | 8bf2dac62ce9c4e4aa62ea5a66831ed65ef35137 /arch | |
| parent | ffd22b8e08fb86692d316cdcc1a4da4d10a016c5 (diff) | |
| download | lwn-eff3b634d9a0cccb6ca8b431819fa415f10804dc.tar.gz lwn-eff3b634d9a0cccb6ca8b431819fa415f10804dc.zip | |
[PATCH] uml: fix net_kern workqueue abuse
Fix up the work on stack and exit scope trouble by placing the work_struct
in the uml_net_private data.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/um/drivers/net_kern.c | 15 | ||||
| -rw-r--r-- | arch/um/include/net_kern.h | 2 |
2 files changed, 11 insertions, 6 deletions
diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c index b2e9762e13c5..afe3d427ddfa 100644 --- a/arch/um/drivers/net_kern.c +++ b/arch/um/drivers/net_kern.c @@ -72,9 +72,11 @@ static int uml_net_rx(struct net_device *dev) return pkt_len; } -static void uml_dev_close(void* dev) +static void uml_dev_close(struct work_struct *work) { - dev_close( (struct net_device *) dev); + struct uml_net_private *lp = + container_of(work, struct uml_net_private, work); + dev_close(lp->dev); } irqreturn_t uml_net_interrupt(int irq, void *dev_id) @@ -89,7 +91,6 @@ irqreturn_t uml_net_interrupt(int irq, void *dev_id) spin_lock(&lp->lock); while((err = uml_net_rx(dev)) > 0) ; if(err < 0) { - DECLARE_WORK(close_work, uml_dev_close, dev); printk(KERN_ERR "Device '%s' read returned %d, shutting it down\n", dev->name, err); @@ -97,9 +98,10 @@ irqreturn_t uml_net_interrupt(int irq, void *dev_id) * again lp->lock. * And dev_close() can be safely called multiple times on the * same device, since it tests for (dev->flags & IFF_UP). So - * there's no harm in delaying the device shutdown. */ - schedule_work(&close_work); -#error this is not permitted - close_work will go out of scope + * there's no harm in delaying the device shutdown. + * Furthermore, the workqueue will not re-enqueue an already + * enqueued work item. */ + schedule_work(&lp->work); goto out; } reactivate_fd(lp->fd, UM_ETH_IRQ); @@ -365,6 +367,7 @@ static int eth_configure(int n, void *init, char *mac, /* This points to the transport private data. It's still clear, but we * must memset it to 0 *now*. Let's help the drivers. */ memset(lp, 0, size); + INIT_WORK(&lp->work, uml_dev_close); /* sysfs register */ if (!driver_registered) { diff --git a/arch/um/include/net_kern.h b/arch/um/include/net_kern.h index 280459fb0b26..218f8b47fdcd 100644 --- a/arch/um/include/net_kern.h +++ b/arch/um/include/net_kern.h @@ -11,6 +11,7 @@ #include <linux/skbuff.h> #include <linux/socket.h> #include <linux/list.h> +#include <linux/workqueue.h> struct uml_net { struct list_head list; @@ -26,6 +27,7 @@ struct uml_net_private { struct net_device *dev; struct timer_list tl; struct net_device_stats stats; + struct work_struct work; int fd; unsigned char mac[ETH_ALEN]; unsigned short (*protocol)(struct sk_buff *); |