lkml.org 
[lkml]   [2014]   [Jun]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/1] staging: media: msi3101: sdr-msi3101.c - replace with time_before_eq()
Date
From: Anil Belur <askb23@gmail.com>

- this fix replaces jiffies interval comparision with safer function to
avoid any overflow and wrap around ?

Signed-off-by: Anil Belur <askb23@gmail.com>
---
drivers/staging/media/msi3101/sdr-msi3101.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/media/msi3101/sdr-msi3101.c b/drivers/staging/media/msi3101/sdr-msi3101.c
index 08d0d09..b828857 100644
--- a/drivers/staging/media/msi3101/sdr-msi3101.c
+++ b/drivers/staging/media/msi3101/sdr-msi3101.c
@@ -180,6 +180,7 @@ static int msi3101_convert_stream_504(struct msi3101_state *s, u8 *dst,
{
int i, i_max, dst_len = 0;
u32 sample_num[3];
+ unsigned long expires;

/* There could be 1-3 1024 bytes URB frames */
i_max = src_len / 1024;
@@ -208,7 +209,8 @@ static int msi3101_convert_stream_504(struct msi3101_state *s, u8 *dst,
}

/* calculate samping rate and output it in 10 seconds intervals */
- if ((s->jiffies_next + msecs_to_jiffies(10000)) <= jiffies) {
+ expires = s->jiffies_next + msecs_to_jiffies(10000);
+ if (time_before_eq(expires, jiffies)) {
unsigned long jiffies_now = jiffies;
unsigned long msecs = jiffies_to_msecs(jiffies_now) - jiffies_to_msecs(s->jiffies_next);
unsigned int samples = sample_num[i_max - 1] - s->sample;
@@ -332,6 +334,7 @@ static int msi3101_convert_stream_384(struct msi3101_state *s, u8 *dst,
{
int i, i_max, dst_len = 0;
u32 sample_num[3];
+ unsigned long expires;

/* There could be 1-3 1024 bytes URB frames */
i_max = src_len / 1024;
@@ -360,7 +363,8 @@ static int msi3101_convert_stream_384(struct msi3101_state *s, u8 *dst,
}

/* calculate samping rate and output it in 10 seconds intervals */
- if ((s->jiffies_next + msecs_to_jiffies(10000)) <= jiffies) {
+ expires = s->jiffies_next + msecs_to_jiffies(10000);
+ if (time_before_eq(expires, jiffies)) {
unsigned long jiffies_now = jiffies;
unsigned long msecs = jiffies_to_msecs(jiffies_now) - jiffies_to_msecs(s->jiffies_next);
unsigned int samples = sample_num[i_max - 1] - s->sample;
@@ -397,6 +401,7 @@ static int msi3101_convert_stream_336(struct msi3101_state *s, u8 *dst,
{
int i, i_max, dst_len = 0;
u32 sample_num[3];
+ unsigned long expires;

/* There could be 1-3 1024 bytes URB frames */
i_max = src_len / 1024;
@@ -425,7 +430,8 @@ static int msi3101_convert_stream_336(struct msi3101_state *s, u8 *dst,
}

/* calculate samping rate and output it in 10 seconds intervals */
- if ((s->jiffies_next + msecs_to_jiffies(10000)) <= jiffies) {
+ expires = s->jiffies_next + msecs_to_jiffies(10000);
+ if (time_before_eq(expires, jiffies)) {
unsigned long jiffies_now = jiffies;
unsigned long msecs = jiffies_to_msecs(jiffies_now) - jiffies_to_msecs(s->jiffies_next);
unsigned int samples = sample_num[i_max - 1] - s->sample;
@@ -460,6 +466,7 @@ static int msi3101_convert_stream_252(struct msi3101_state *s, u8 *dst,
{
int i, i_max, dst_len = 0;
u32 sample_num[3];
+ unsigned long expires;

/* There could be 1-3 1024 bytes URB frames */
i_max = src_len / 1024;
@@ -488,7 +495,8 @@ static int msi3101_convert_stream_252(struct msi3101_state *s, u8 *dst,
}

/* calculate samping rate and output it in 10 seconds intervals */
- if ((s->jiffies_next + msecs_to_jiffies(10000)) <= jiffies) {
+ expires = s->jiffies_next + msecs_to_jiffies(10000);
+ if (time_before_eq(expires, jiffies)) {
unsigned long jiffies_now = jiffies;
unsigned long msecs = jiffies_to_msecs(jiffies_now) - jiffies_to_msecs(s->jiffies_next);
unsigned int samples = sample_num[i_max - 1] - s->sample;
--
1.9.1


\
 
 \ /
  Last update: 2014-06-29 08:01    [W:0.062 / U:0.400 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site