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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>
This commit is contained in:
Todd Fujinaka 2014-01-18 06:09:33 +00:00 committed by Jeff Kirsher
parent 37147652cf
commit 6c2ed39c1c
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/intel/e1000e/ptp.c
View File

@ -47,6 +47,7 @@ static int e1000e_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta)
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 @@ static int e1000e_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta)
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 @@ static int e1000e_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta)
ew32(TIMINCA, timinca);
spin_unlock_irqrestore(&adapter->systim_lock, flags);
return 0;
}