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igb: serialize access to the time sync interrupt registers

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The time sync related interrupt registers may be manipulated from
different contexts. This patch protects the registers from being
asynchronously changed by the reset function.

Also, the patch removes a misleading comment. The reset function
is disabling a bunch of functions, not enabling them.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Richard Cochran 2014-11-21 20:51:15 +00:00 committed by Jeff Kirsher
parent 61d7f75f45
commit 8298c1ecd5
1 changed files with 7 additions and 3 deletions
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10
drivers/net/ethernet/intel/igb/igb_ptp.c
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@ -900,6 +900,7 @@ void igb_ptp_stop(struct igb_adapter *adapter)
void igb_ptp_reset(struct igb_adapter *adapter)
{
struct e1000_hw *hw = &adapter->hw;
unsigned long flags;
if (!(adapter->flags & IGB_FLAG_PTP))
return;
@ -907,6 +908,8 @@ void igb_ptp_reset(struct igb_adapter *adapter)
/* reset the tstamp_config */
igb_ptp_set_timestamp_mode(adapter, &adapter->tstamp_config);
spin_lock_irqsave(&adapter->tmreg_lock, flags);
switch (adapter->hw.mac.type) {
case e1000_82576:
/* Dial the nominal frequency. */
@ -917,23 +920,24 @@ void igb_ptp_reset(struct igb_adapter *adapter)
case e1000_i350:
case e1000_i210:
case e1000_i211:
/* Enable the timer functions and interrupts. */
wr32(E1000_TSAUXC, 0x0);
wr32(E1000_TSIM, TSYNC_INTERRUPTS);
wr32(E1000_IMS, E1000_IMS_TS);
break;
default:
/* No work to do. */
return;
goto out;
}
/* Re-initialize the timer. */
if ((hw->mac.type == e1000_i210) || (hw->mac.type == e1000_i211)) {
struct timespec ts = ktime_to_timespec(ktime_get_real());
igb_ptp_settime_i210(&adapter->ptp_caps, &ts);
igb_ptp_write_i210(adapter, &ts);
} else {
timecounter_init(&adapter->tc, &adapter->cc,
ktime_to_ns(ktime_get_real()));
}
out:
spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
}