1 files changed, 13 insertions, 2 deletions

diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c
index f3442ce29a21..8ebb2241ad42 100644
--- a/arch/um/drivers/net_kern.c
+++ b/arch/um/drivers/net_kern.c
@@ -68,6 +68,11 @@ static int uml_net_rx(struct net_device *dev)
         return pkt_len;
 }
 
+static void uml_dev_close(void* dev)
+{
+        dev_close( (struct net_device *) dev);
+}
+
 irqreturn_t uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 {
         struct net_device *dev = dev_id;
@@ -80,15 +85,21 @@ irqreturn_t uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
         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);
-                dev_close(dev);
+                /* dev_close can't be called in interrupt context, and takes
+                 * 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);
                 goto out;
         }
         reactivate_fd(lp->fd, UM_ETH_IRQ);
 
- out:
+out:
         spin_unlock(&lp->lock);
         return(IRQ_HANDLED);
 }