net: fec: fix spin_lock dead lock

=========================================================
[ INFO: possible irq lock inversion dependency detected ]
3.8.0-rc5+ #82 Not tainted
---------------------------------------------------------
swapper/0/0 just changed the state of lock:
 (&(&fep->hw_lock)->rlock){..-...}, at: [<8034e2f8>] fec_enet_start_xmit+0x48/0x                      2cc
but this lock took another, SOFTIRQ-unsafe lock in the past:
(prepare_lock){+.+.+.}

and interrupts could create inverse lock ordering between them.
other info that might help us debug this:
Possible interrupt unsafe locking scenario:

CPU0				CPU1
----				----
lock(prepare_lock);
				local_irq_disable()
				lock(&(&fep->hw_lock)->rlock);
				lock(prepare_lock);
<Interrupt>
lock(&(&fep->hw_lock)->rlock);

*** DEADLOCK ***

Signed-off-by: Frank Li <Frank.Li@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/freescale/fec_ptp.c b/drivers/net/ethernet/freescale/fec_ptp.c
index c40526c..1f17ca0 100644 (file)
--- a/drivers/net/ethernet/freescale/fec_ptp.c
+++ b/drivers/net/ethernet/freescale/fec_ptp.c
@@ -104,7 +104,7 @@ void fec_ptp_start_cyclecounter(struct net_device *ndev)
        unsigned long flags;
        int inc;
 
-       inc = 1000000000 / clk_get_rate(fep->clk_ptp);
+       inc = 1000000000 / fep->cycle_speed;
 
        /* grab the ptp lock */
        spin_lock_irqsave(&fep->tmreg_lock, flags);
@@ -363,6 +363,8 @@ void fec_ptp_init(struct net_device *ndev, struct platform_device *pdev)
        fep->ptp_caps.settime = fec_ptp_settime;
        fep->ptp_caps.enable = fec_ptp_enable;
 
+       fep->cycle_speed = clk_get_rate(fep->clk_ptp);
+
        spin_lock_init(&fep->tmreg_lock);
 
        fec_ptp_start_cyclecounter(ndev);