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Date: Sun, 29 Jun 2014 10:50:16 +0530
From: Anil Belur <askb23@...il.com>
To: m.chehab@...sung.com, crope@....fi, gregkh@...uxfoundation.org
Cc: devel@...verdev.osuosl.org, linux-media@...r.kernel.org,
linux-kernel@...r.kernel.org, Anil Belur <askb23@...il.com>
Subject: [PATCH 1/1] staging: media: msi3101: sdr-msi3101.c - replace with time_before_eq()
From: Anil Belur <askb23@...il.com>
- this fix replaces jiffies interval comparision with safer function to
avoid any overflow and wrap around ?
Signed-off-by: Anil Belur <askb23@...il.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
--
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