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| author | Abhilash Jindal <klock.android@gmail.com> | 2015-08-11 17:09:49 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-08-16 18:29:31 +0200 |
| commit | e4d45dd81e67f9fe0e1af44bddd53c3d4eb061ea (patch) | |
| tree | a68e254fa804ffa5b60ff11949d42a1aa5b824a9 | |
| parent | [media] i2c/adv7511: Fix license, set to GPL v2 (diff) | |
| download | linux-e4d45dd81e67f9fe0e1af44bddd53c3d4eb061ea.tar.xz linux-e4d45dd81e67f9fe0e1af44bddd53c3d4eb061ea.zip | |
[media] zoran: Use monotonic time
Wall time obtained from do_gettimeofday is susceptible to sudden jumps due to
user setting the time or due to NTP.
Monotonic time is constantly increasing time better suited for comparing two
timestamps.
Signed-off-by: Abhilash Jindal <klock.android@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
| -rw-r--r-- | drivers/media/pci/zoran/zoran_device.c | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/drivers/media/pci/zoran/zoran_device.c b/drivers/media/pci/zoran/zoran_device.c index 40119b3c52c1..4d47ddac97dc 100644 --- a/drivers/media/pci/zoran/zoran_device.c +++ b/drivers/media/pci/zoran/zoran_device.c @@ -31,6 +31,7 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/vmalloc.h> +#include <linux/ktime.h> #include <linux/interrupt.h> #include <linux/proc_fs.h> @@ -181,20 +182,11 @@ dump_guests (struct zoran *zr) } } -static inline unsigned long -get_time (void) -{ - struct timeval tv; - - do_gettimeofday(&tv); - return (1000000 * tv.tv_sec + tv.tv_usec); -} - void detect_guest_activity (struct zoran *zr) { int timeout, i, j, res, guest[8], guest0[8], change[8][3]; - unsigned long t0, t1; + ktime_t t0, t1; dump_guests(zr); printk(KERN_INFO "%s: Detecting guests activity, please wait...\n", @@ -205,15 +197,15 @@ detect_guest_activity (struct zoran *zr) timeout = 0; j = 0; - t0 = get_time(); + t0 = ktime_get(); while (timeout < 10000) { udelay(10); timeout++; for (i = 1; (i < 8) && (j < 8); i++) { res = post_office_read(zr, i, 0); if (res != guest[i]) { - t1 = get_time(); - change[j][0] = (t1 - t0); + t1 = ktime_get(); + change[j][0] = ktime_to_us(ktime_sub(t1, t0)); t0 = t1; change[j][1] = i; change[j][2] = res; |