iwlwifi: correct math in elapsed_jiffies
w/o the first change: if end == start you get MAX_JIFFY_OFFSET which
isn't what you want...
For the latter I think to be technically correct you need the +1 to
account for the jiffy between MAX_JIFFY_OFFSET and 0
(hmm w/ the 2nd change the first isn't strictly needed... ah well)
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/wireless/iwlwifi/iwl-helpers.h b/drivers/net/wireless/iwlwifi/iwl-helpers.h
index cd2eb18..cb009f4 100644
--- a/drivers/net/wireless/iwlwifi/iwl-helpers.h
+++ b/drivers/net/wireless/iwlwifi/iwl-helpers.h
@@ -246,10 +246,10 @@
static inline unsigned long elapsed_jiffies(unsigned long start,
unsigned long end)
{
- if (end > start)
+ if (end >= start)
return end - start;
- return end + (MAX_JIFFY_OFFSET - start);
+ return end + (MAX_JIFFY_OFFSET - start) + 1;
}
static inline u8 iwl_get_dma_hi_address(dma_addr_t addr)