e1000e: PTP lock in e1000e_phc_adjustfreq
Add lock in e1000e_phc_adjfreq to prevent concurrent changes to TIMINCA
and SYSTIMH/L.
Signed-off-by: Todd Fujinaka <todd.fujinaka@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/e1000e/ptp.c b/drivers/net/ethernet/intel/e1000e/ptp.c
index 065f8c8..e24160d 100644
--- a/drivers/net/ethernet/intel/e1000e/ptp.c
+++ b/drivers/net/ethernet/intel/e1000e/ptp.c
@@ -47,6 +47,7 @@
ptp_clock_info);
struct e1000_hw *hw = &adapter->hw;
bool neg_adj = false;
+ unsigned long flags;
u64 adjustment;
u32 timinca, incvalue;
s32 ret_val;
@@ -64,6 +65,8 @@
if (ret_val)
return ret_val;
+ spin_lock_irqsave(&adapter->systim_lock, flags);
+
incvalue = timinca & E1000_TIMINCA_INCVALUE_MASK;
adjustment = incvalue;
@@ -77,6 +80,8 @@
ew32(TIMINCA, timinca);
+ spin_unlock_irqrestore(&adapter->systim_lock, flags);
+
return 0;
}