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authorTina Ruchandani <ruchandani.tina@gmail.com>2015-05-31 04:17:06 -0300
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-06-09 21:09:51 -0300
commit9056a23ba19d911d4a079b8ca543fb8ebffa7c56 (patch)
treec4c4317831ba2bf1e12f04fe689715f2c7378677 /drivers/media/dvb-core
parentd3525b632a0b5e113fb78b7db84598e082cf903b (diff)
[media] dvb-frontend: Replace timeval with ktime_t
struct timeval uses a 32-bit seconds representation which will overflow in the year 2038 and beyond. This patch replaces the usage of struct timeval with ktime_t which is a 64-bit timestamp and is year 2038 safe. This patch is part of a larger attempt to remove all instances of 32-bit timekeeping variables (timeval, timespec, time_t) which are not year 2038 safe, from the kernel. [mchehab@osg.samsung.com: add a missing parenthesis, breaking compilation] Suggested-by: Arnd Bergmann <arndb@arndb.de> Signed-off-by: Tina Ruchandani <ruchandani.tina@gmail.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media/dvb-core')
-rw-r--r--drivers/media/dvb-core/dvb_frontend.c41
-rw-r--r--drivers/media/dvb-core/dvb_frontend.h3
2 files changed, 12 insertions, 32 deletions
diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c
index 55a6b0500615..b30ca59de04f 100644
--- a/drivers/media/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb-core/dvb_frontend.c
@@ -40,6 +40,7 @@
#include <linux/freezer.h>
#include <linux/jiffies.h>
#include <linux/kthread.h>
+#include <linux/ktime.h>
#include <asm/processor.h>
#include "dvb_frontend.h"
@@ -890,42 +891,21 @@ static void dvb_frontend_stop(struct dvb_frontend *fe)
fepriv->thread);
}
-s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime)
-{
- return ((curtime.tv_usec < lasttime.tv_usec) ?
- 1000000 - lasttime.tv_usec + curtime.tv_usec :
- curtime.tv_usec - lasttime.tv_usec);
-}
-EXPORT_SYMBOL(timeval_usec_diff);
-
-static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec)
-{
- curtime->tv_usec += add_usec;
- if (curtime->tv_usec >= 1000000) {
- curtime->tv_usec -= 1000000;
- curtime->tv_sec++;
- }
-}
-
/*
* Sleep until gettimeofday() > waketime + add_usec
* This needs to be as precise as possible, but as the delay is
* usually between 2ms and 32ms, it is done using a scheduled msleep
* followed by usleep (normally a busy-wait loop) for the remainder
*/
-void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec)
+void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
{
- struct timeval lasttime;
s32 delta, newdelta;
- timeval_usec_add(waketime, add_usec);
-
- do_gettimeofday(&lasttime);
- delta = timeval_usec_diff(lasttime, *waketime);
+ ktime_add_us(*waketime, add_usec);
+ delta = ktime_us_delta(ktime_get_real(), *waketime);
if (delta > 2500) {
msleep((delta - 1500) / 1000);
- do_gettimeofday(&lasttime);
- newdelta = timeval_usec_diff(lasttime, *waketime);
+ newdelta = ktime_us_delta(ktime_get_real(), *waketime);
delta = (newdelta > delta) ? 0 : newdelta;
}
if (delta > 0)
@@ -2463,13 +2443,13 @@ static int dvb_frontend_ioctl_legacy(struct file *file,
* include the initialization or start bit
*/
unsigned long swcmd = ((unsigned long) parg) << 1;
- struct timeval nexttime;
- struct timeval tv[10];
+ ktime_t nexttime;
+ ktime_t tv[10];
int i;
u8 last = 1;
if (dvb_frontend_debug)
printk("%s switch command: 0x%04lx\n", __func__, swcmd);
- do_gettimeofday(&nexttime);
+ nexttime = ktime_get_real();
if (dvb_frontend_debug)
tv[0] = nexttime;
/* before sending a command, initialize by sending
@@ -2480,7 +2460,7 @@ static int dvb_frontend_ioctl_legacy(struct file *file,
for (i = 0; i < 9; i++) {
if (dvb_frontend_debug)
- do_gettimeofday(&tv[i + 1]);
+ tv[i+1] = ktime_get_real();
if ((swcmd & 0x01) != last) {
/* set voltage to (last ? 13V : 18V) */
fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);
@@ -2494,7 +2474,8 @@ static int dvb_frontend_ioctl_legacy(struct file *file,
printk("%s(%d): switch delay (should be 32k followed by all 8k\n",
__func__, fe->dvb->num);
for (i = 1; i < 10; i++)
- printk("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i]));
+ printk("%d: %d\n", i,
+ (int) ktime_us_delta(tv[i], tv[i-1]));
}
err = 0;
fepriv->state = FESTATE_DISEQC;
diff --git a/drivers/media/dvb-core/dvb_frontend.h b/drivers/media/dvb-core/dvb_frontend.h
index 4ff82041fdfd..4816947294fe 100644
--- a/drivers/media/dvb-core/dvb_frontend.h
+++ b/drivers/media/dvb-core/dvb_frontend.h
@@ -441,7 +441,6 @@ extern void dvb_frontend_reinitialise(struct dvb_frontend *fe);
extern int dvb_frontend_suspend(struct dvb_frontend *fe);
extern int dvb_frontend_resume(struct dvb_frontend *fe);
-extern void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec);
-extern s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime);
+extern void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec);
#endif

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