irda: ali-ircc: Replace timeval with ktime_t

The ali ircc driver uses 'timeval', which we try to remove in the kernel
because all 32-bit time types will break in the year 2038.

This patch also changes do_gettimeofday() to ktime_get() accordingly,
since ktime_get returns a ktime_t, but do_gettimeofday returns a
struct timeval, and the other reason is that ktime_get() uses
the monotonic clock.

This patch uses ktime_us_delta to get the elapsed time, and in this
way it no longer needs to check for the overflow, because
ktime_us_delta returns time difference of microsecond.

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 5 insertions, 11 deletions

diff --git a/drivers/net/irda/ali-ircc.c b/drivers/net/irda/ali-ircc.c
index 58f98f4de773..58ae11a14bb6 100644
--- a/drivers/net/irda/ali-ircc.c
+++ b/drivers/net/irda/ali-ircc.c
@@ -1462,17 +1462,12 @@ static netdev_tx_t ali_ircc_fir_hard_xmit(struct sk_buff *skb,
                 if (mtt) 
                 {
                         /* Check how much time we have used already */
-                        do_gettimeofday(&self->now);
-                        
-                        diff = self->now.tv_usec - self->stamp.tv_usec;
+                        diff = ktime_us_delta(ktime_get(), self->stamp);
                         /* self->stamp is set from ali_ircc_dma_receive_complete() */
                                                         
                         pr_debug("%s(), ******* diff = %d *******\n",
                                  __func__, diff);
-                        
-                        if (diff < 0) 
-                                diff += 1000000;
-                        
+
                         /* Check if the mtt is larger than the time we have
                          * already used by all the protocol processing
                          */
@@ -1884,7 +1879,7 @@ static int  ali_ircc_dma_receive_complete(struct ali_ircc_cb *self)
                          * reduce the min turn time a bit since we will know
                          * how much time we have used for protocol processing
                          */
-                        do_gettimeofday(&self->stamp);
+                        self->stamp = ktime_get();
 
                         skb = dev_alloc_skb(len+1);
                         if (skb == NULL)  
diff --git a/drivers/net/irda/ali-ircc.h b/drivers/net/irda/ali-ircc.h
index 0c8edb41bd0a..c2d9747a5108 100644
--- a/drivers/net/irda/ali-ircc.h
+++ b/drivers/net/irda/ali-ircc.h
@@ -22,7 +22,7 @@
 #ifndef ALI_IRCC_H
 #define ALI_IRCC_H
 
-#include <linux/time.h>
+#include <linux/ktime.h>
 
 #include <linux/spinlock.h>
 #include <linux/pm.h>
@@ -209,8 +209,7 @@ struct ali_ircc_cb {
         
         unsigned char rcvFramesOverflow;
                 
-        struct timeval stamp;
-        struct timeval now;
+        ktime_t stamp;
 
         spinlock_t lock;           /* For serializing operations */