* [PATCH] media: si21xx: use time_after_eq() instead of jiffies judgment
@ 2022-02-10 8:31 Qing Wang
2022-02-10 9:07 ` Joe Perches
0 siblings, 1 reply; 2+ messages in thread
From: Qing Wang @ 2022-02-10 8:31 UTC (permalink / raw)
To: Mauro Carvalho Chehab, linux-media, linux-kernel; +Cc: Wang Qing
From: Wang Qing <wangqing@vivo.com>
It is better to use time_xxx() directly instead of jiffies judgment
for understanding.
Signed-off-by: Wang Qing <wangqing@vivo.com>
---
drivers/media/dvb-frontends/si21xx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/media/dvb-frontends/si21xx.c b/drivers/media/dvb-frontends/si21xx.c
index 001b235..1c6cf76
--- a/drivers/media/dvb-frontends/si21xx.c
+++ b/drivers/media/dvb-frontends/si21xx.c
@@ -336,7 +336,7 @@ static int si21xx_wait_diseqc_idle(struct si21xx_state *state, int timeout)
dprintk("%s\n", __func__);
while ((si21_readreg(state, LNB_CTRL_REG_1) & 0x8) == 8) {
- if (jiffies - start > timeout) {
+ if (time_after(jiffies, start + timeout)) {
dprintk("%s: timeout!!\n", __func__);
return -ETIMEDOUT;
}
--
2.7.4
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] media: si21xx: use time_after_eq() instead of jiffies judgment
2022-02-10 8:31 [PATCH] media: si21xx: use time_after_eq() instead of jiffies judgment Qing Wang
@ 2022-02-10 9:07 ` Joe Perches
0 siblings, 0 replies; 2+ messages in thread
From: Joe Perches @ 2022-02-10 9:07 UTC (permalink / raw)
To: Qing Wang, Mauro Carvalho Chehab, linux-media, linux-kernel
On Thu, 2022-02-10 at 00:31 -0800, Qing Wang wrote:
> From: Wang Qing <wangqing@vivo.com>
>
> It is better to use time_xxx() directly instead of jiffies judgment
> for understanding.
[]
> diff --git a/drivers/media/dvb-frontends/si21xx.c b/drivers/media/dvb-frontends/si21xx.c
[]
> @@ -336,7 +336,7 @@ static int si21xx_wait_diseqc_idle(struct si21xx_state *state, int timeout)
> dprintk("%s\n", __func__);
>
> while ((si21_readreg(state, LNB_CTRL_REG_1) & 0x8) == 8) {
> - if (jiffies - start > timeout) {
> + if (time_after(jiffies, start + timeout)) {
> dprintk("%s: timeout!!\n", __func__);
> return -ETIMEDOUT;
> }
Appreciate all the conversions (IMO it should have been sent as
a block of patches with a cover letter instead of independent
unrelated patches) but wouldn't all of these be simpler and more
consistent using a style where the addition is done once and the
timeout test is something like:
unsigned long end = jiffies + timeout;
while (foo) {
if (time_after(jiffies, end)) {
error_msg(...)
return -ETIMEDOUT;
}
bar...;
}
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-02-10 8:31 [PATCH] media: si21xx: use time_after_eq() instead of jiffies judgment Qing Wang
2022-02-10 9:07 ` Joe Perches
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