irda: nsc-ircc: Replace timeval with ktime_t

The nsc 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>

diff --git a/drivers/net/irda/nsc-ircc.c b/drivers/net/irda/nsc-ircc.c
index e7317b1..dc0dbd8 100644 (file)
--- a/drivers/net/irda/nsc-ircc.c
+++ b/drivers/net/irda/nsc-ircc.c
@@ -1501,10 +1501,7 @@ static netdev_tx_t nsc_ircc_hard_xmit_fir(struct sk_buff *skb,
                mtt = irda_get_mtt(skb);
                if (mtt) {
                        /* Check how much time we have used already */
-                       do_gettimeofday(&self->now);
-                       diff = self->now.tv_usec - self->stamp.tv_usec;
-                       if (diff < 0) 
-                               diff += 1000000;
+                       diff = ktime_us_delta(ktime_get(), self->stamp);
                        
                        /* Check if the mtt is larger than the time we have
                         * already used by all the protocol processing
@@ -1867,7 +1864,7 @@ static int nsc_ircc_dma_receive_complete(struct nsc_ircc_cb *self, int iobase)
                         * 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/nsc-ircc.h b/drivers/net/irda/nsc-ircc.h
index 32fa582..7be5acb 100644 (file)
--- a/drivers/net/irda/nsc-ircc.h
+++ b/drivers/net/irda/nsc-ircc.h
@@ -28,7 +28,7 @@
 #ifndef NSC_IRCC_H
 #define NSC_IRCC_H
 
-#include <linux/time.h>
+#include <linux/ktime.h>
 
 #include <linux/spinlock.h>
 #include <linux/pm.h>
@@ -263,8 +263,7 @@ struct nsc_ircc_cb {
 
        __u8 ier;                  /* Interrupt enable register */
 
-       struct timeval stamp;
-       struct timeval now;
+       ktime_t stamp;
 
        spinlock_t lock;           /* For serializing operations */