linux-kernel - Re: [PATCH] Evdev: Fix bug in checking duplicate clock change request

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Date:	Fri, 30 Oct 2015 18:34:48 +0530
From:	Aniroop Mathur <aniroop.mathur@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Aniroop Mathur <a.mathur@...sung.com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Evdev: Fix bug in checking duplicate clock change request

Hello Mr. Torokhov,

On Fri, Oct 30, 2015 at 4:45 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> Hi Aniroop,
>
> On Thu, Oct 29, 2015 at 01:38:32AM +0530, Aniroop Mathur wrote:
>> From: Aniroop Mathur <a.mathur@...sung.com>
>>
>> clk_type and clkid stores different predefined clock identification
>> values so they cannot be compared for checking duplicate clock change
>> request. Therefore, lets fix it to avoid unexpected results.
>
> Good catch!
>

Thank you :)

>>
>> Signed-off-by: Aniroop Mathur <a.mathur@...sung.com>
>> Signed-off-by: Aniroop Mathur <aniroop.mathur@...il.com>
>
> You only need one signoff, which one should I keep? The Samsung one?
>

Yes, Samsung one.

>> ---
>>  drivers/input/evdev.c | 10 ++++++----
>>  1 file changed, 6 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
>> index 08d4964..0d40f6f 100644
>> --- a/drivers/input/evdev.c
>> +++ b/drivers/input/evdev.c
>> @@ -56,7 +56,7 @@ struct evdev_client {
>>       struct fasync_struct *fasync;
>>       struct evdev *evdev;
>>       struct list_head node;
>> -     int clk_type;
>> +     unsigned int clk_type;
>>       bool revoked;
>>       unsigned int bufsize;
>>       struct input_event buffer[];
>> @@ -146,9 +146,7 @@ static void evdev_queue_syn_dropped(struct evdev_client *client)
>>  static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid)
>>  {
>>       unsigned long flags;
>> -
>> -     if (client->clk_type == clkid)
>> -             return 0;
>> +     unsigned int prev_clk_type = client->clk_type;
>
> I prefer the other way around: convert to a temp and then compare. I;ll
> fix it up on my side.
>

I thought that was the only better way of all.
I am not sure what exactly you're referring. I guess I need little
more elaboration here or anyways, I'll check it up up once you apply
it.

>>
>>       switch (clkid) {
>>
>> @@ -165,6 +163,10 @@ static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid)
>>               return -EINVAL;
>>       }
>>
>> +     /* No need to flush if clk_type is same as before */
>> +     if (client->clk_type == prev_clk_type)
>> +             return 0;
>> +
>>       /*
>>        * Flush pending events and queue SYN_DROPPED event,
>>        * but only if the queue is not empty.
>> --
>> 2.6.2
>>
>
> Thanks.
>
> --
> Dmitry

Regards,
Aniroop
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