tree 6abca9359bef605709b18b85ecde8d0d0dc1cb97
parent 437d62719b3dbda51ca559177402d51976bc4efb
author Haavard Skinnemoen <haavard.skinnemoen@atmel.com> 1211797150 +0200
committer Haavard Skinnemoen <haavard.skinnemoen@atmel.com> 1211894851 +0200

avr32: Fix theoretical race in udelay()

If the specified delay is very short, the cycle counter may go past the
"end" time we are waiting for before we get around to reading it.

Fix it by checking the different between the cycle count "now" and the
cycle count at the beginning. This will work as long as the delay
measured in number of cycles is below 2^31.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>