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ath5k: Disable interrupts in ath5k_hw_get_tsf64

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The code in ath5k_hw_get_tsf64() is time critical and will return wrong results
if we get interrupted, so disable local interrupts.

Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Bruno Randolf 2010-09-27 12:22:32 +09:00 committed by John W. Linville
parent 11f21df36c
commit 28df897a42
1 changed files with 6 additions and 0 deletions
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6
drivers/net/wireless/ath/ath5k/pcu.c
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@ -495,6 +495,10 @@ u64 ath5k_hw_get_tsf64(struct ath5k_hw *ah)
{
u32 tsf_lower, tsf_upper1, tsf_upper2;
int i;
unsigned long flags;
/* This code is time critical - we don't want to be interrupted here */
local_irq_save(flags);
/*
* While reading TSF upper and then lower part, the clock is still
@ -517,6 +521,8 @@ u64 ath5k_hw_get_tsf64(struct ath5k_hw *ah)
tsf_upper1 = tsf_upper2;
}
local_irq_restore(flags);
WARN_ON( i == ATH5K_MAX_TSF_READ );
return (((u64)tsf_upper1 << 32) | tsf_lower);