diff options
| author | Frank Li <Frank.Li@freescale.com> | 2013-02-06 18:59:59 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-02-08 08:36:41 +0400 |
| commit | 85bd1798b24a13462d7b064961e7a9da3bb12db1 (patch) | |
| tree | f320859920594383cc70f3448a943b11242757b6 /drivers/net | |
| parent | 365cc174648cd7e9b11e522c3d5b07ccf3c60d99 (diff) | |
| download | linux-85bd1798b24a13462d7b064961e7a9da3bb12db1.tar.xz | |
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>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/freescale/fec_ptp.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/net/ethernet/freescale/fec_ptp.c b/drivers/net/ethernet/freescale/fec_ptp.c index c40526c78c20..1f17ca0f2201 100644 --- 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); |