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Commit 22747d6b authored by Francois Romieu's avatar Francois Romieu Committed by Jeff Garzik
Browse files

s2io: RTNL and flush_scheduled_work deadlock 



Mantra: don't use flush_scheduled_work with RTNL held.

Signed-off-by: default avatarFrancois Romieu <romieu@fr.zoreil.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 83cbb4d2

drivers/net/s2io.c

+18 −3
Original line number Diff line number Diff line
@@ -3758,7 +3758,6 @@ static int s2io_close(struct net_device *dev) 
{

	struct s2io_nic *sp = dev->priv;



	flush_scheduled_work();

	netif_stop_queue(dev);

	/* Reset card, kill tasklet and free Tx and Rx buffers. */

	s2io_card_down(sp);
@@ -5847,9 +5846,14 @@ static void s2io_set_link(struct work_struct *work) 
	register u64 val64;

	u16 subid;



	rtnl_lock();



	if (!netif_running(dev))

		goto out_unlock;



	if (test_and_set_bit(0, &(nic->link_state))) {

		/* The card is being reset, no point doing anything */

		return;

		goto out_unlock;

	}



	subid = nic->pdev->subsystem_device;
@@ -5903,6 +5907,9 @@ static void s2io_set_link(struct work_struct *work) 
		s2io_link(nic, LINK_DOWN);

	}

	clear_bit(0, &(nic->link_state));



out_unlock:

	rtnl_lock();

}



static int set_rxd_buffer_pointer(struct s2io_nic *sp, struct RxD_t *rxdp,
@@ -6356,6 +6363,11 @@ static void s2io_restart_nic(struct work_struct *work) 
	struct s2io_nic *sp = container_of(work, struct s2io_nic, rst_timer_task);

	struct net_device *dev = sp->dev;



	rtnl_lock();



	if (!netif_running(dev))

		goto out_unlock;



	s2io_card_down(sp);

	if (s2io_card_up(sp)) {

		DBG_PRINT(ERR_DBG, "%s: Device bring up failed\n",
@@ -6364,7 +6376,8 @@ static void s2io_restart_nic(struct work_struct *work) 
	netif_wake_queue(dev);

	DBG_PRINT(ERR_DBG, "%s: was reset by Tx watchdog timer\n",

		  dev->name);



out_unlock:

	rtnl_unlock();

}



/**
@@ -7173,6 +7186,8 @@ static void __devexit s2io_rem_nic(struct pci_dev *pdev) 
		return;

	}



	flush_scheduled_work();



	sp = dev->priv;

	unregister_netdev(dev);