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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>
This commit is contained in:
Chunyan Zhang 2015-01-08 12:01:30 +08:00 committed by David S. Miller
parent ca98278a14
commit 4c3bd197a0
2 changed files with 4 additions and 8 deletions
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7
drivers/net/irda/nsc-ircc.c
View File

@ -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) {

5
drivers/net/irda/nsc-ircc.h
View File

@ -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 */