linux-kernel - RE: [PATCH] media: wl128x: use time_after

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Date:   Thu, 10 Feb 2022 09:49:01 +0000
From:   王擎 <wangqing@...o.com>
To:     Kieran Bingham <kieran.bingham@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>
Subject: RE: [PATCH] media: wl128x: use time_after_eq() instead of jiffies
 judgment

>
>Hi,
>
>All of these patches you've just sent say "Use time_after_eq()" in the
>subject, but I haven't yet seen a usage of that.
>
>Could you make your patch subject reflective of the true changes in each
>patch please?
>
>Batching them in a series as suggested by Joe would be helpful too.
>

My fault, I will correct and batch them in a series for V2

>Quoting Qing Wang (2022-02-10 08:32:39)
>> From: Wang Qing <wangqing@...o.com>
>> 
>> It is better to use time_xxx() directly instead of jiffies judgment
>> for understanding.
>> 
>> Signed-off-by: Wang Qing <wangqing@...o.com>
>> ---
>>  drivers/media/radio/wl128x/fmdrv_common.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/media/radio/wl128x/fmdrv_common.c b/drivers/media/radio/wl128x/fmdrv_common.c
>> index 6142484d..a599d08
>> --- a/drivers/media/radio/wl128x/fmdrv_common.c
>> +++ b/drivers/media/radio/wl128x/fmdrv_common.c
>> @@ -23,6 +23,7 @@
>>  #include <linux/firmware.h>
>>  #include <linux/module.h>
>>  #include <linux/nospec.h>
>> +#include <linux/jiffies.h>
>>  
>>  #include "fmdrv.h"
>>  #include "fmdrv_v4l2.h"
>> @@ -342,7 +343,7 @@ static void send_tasklet(struct tasklet_struct *t)
>>                 return;
>>  
>>         /* Check, is there any timeout happened to last transmitted packet */
>> -       if ((jiffies - fmdev->last_tx_jiffies) > FM_DRV_TX_TIMEOUT) {
>> +       if (time_after(jiffies, fmdev->last_tx_jiffies + FM_DRV_TX_TIMEOUT)) {
>
>It looks like there are specific macros for working with jiffies too.
>
>Should this be 
>             time_is_after_jiffies(fmdev->last_tx_jiffies + FM_DRV_TX_TIMEOUT) {
>
>Although that is in fact 2 characters longer ;-S

Accept it, thanks

Qing
>
>
>--
>Kieran
>
>
>>                 fmerr("TX timeout occurred\n");
>>                 atomic_set(&fmdev->tx_cnt, 1);
>>         }
>> -- 
>> 2.7.4
>>