irda: stir4200: Replace timeval with ktime_t

The stir4200 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 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>

1 files changed, 7 insertions, 9 deletions

diff --git a/drivers/net/irda/stir4200.c b/drivers/net/irda/stir4200.c
index dd1bd1060ec9..83cc48a01802 100644
--- a/drivers/net/irda/stir4200.c
+++ b/drivers/net/irda/stir4200.c
@@ -40,6 +40,7 @@
 #include <linux/moduleparam.h>
 
 #include <linux/kernel.h>
+#include <linux/ktime.h>
 #include <linux/types.h>
 #include <linux/time.h>
 #include <linux/skbuff.h>
@@ -174,7 +175,7 @@ struct stir_cb {
         __u8              *fifo_status;
 
         iobuff_t          rx_buff;      /* receive unwrap state machine */
-        struct timeval    rx_time;
+        ktime_t         rx_time;
         int               receiving;
         struct urb       *rx_urb;
 };
@@ -650,15 +651,12 @@ static int fifo_txwait(struct stir_cb *stir, int space)
 static void turnaround_delay(const struct stir_cb *stir, long us)
 {
         long ticks;
-        struct timeval now;
 
         if (us <= 0)
                 return;
 
-        do_gettimeofday(&now);
-        if (now.tv_sec - stir->rx_time.tv_sec > 0)
-                us -= USEC_PER_SEC;
-        us -= now.tv_usec - stir->rx_time.tv_usec;
+        us -= ktime_us_delta(ktime_get(), stir->rx_time);
+
         if (us < 10)
                 return;
 
@@ -823,8 +821,8 @@ static void stir_rcv_irq(struct urb *urb)
                 pr_debug("receive %d\n", urb->actual_length);
                 unwrap_chars(stir, urb->transfer_buffer,
                              urb->actual_length);
-                
-                do_gettimeofday(&stir->rx_time);
+
+                stir->rx_time = ktime_get();
         }
 
         /* kernel thread is stopping receiver don't resubmit */
@@ -876,7 +874,7 @@ static int stir_net_open(struct net_device *netdev)
 
         skb_reserve(stir->rx_buff.skb, 1);
         stir->rx_buff.head = stir->rx_buff.skb->data;
-        do_gettimeofday(&stir->rx_time);
+        stir->rx_time = ktime_get();
 
         stir->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
         if (!stir->rx_urb)