linux-kernel - Re: [PATCH] staging: greybus: Convert timers to use timer

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Date:   Tue, 24 Oct 2017 10:40:30 +0100
From:   Bryan O'Donoghue <pure.logic@...us-software.ie>
To:     Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Johan Hovold <johan@...nel.org>, Alex Elder <elder@...nel.org>,
        greybus-dev@...ts.linaro.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: greybus: Convert timers to use timer_setup()

On 24/10/17 10:35, Bryan O'Donoghue wrote:
> On 24/10/17 09:25, Kees Cook wrote:
>> In preparation for unconditionally passing the struct timer_list 
>> pointer to
>> all timer callbacks, switch to using the new timer_setup() and 
>> from_timer()
>> to pass the timer pointer explicitly.
>>
>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> Cc: "Bryan O'Donoghue" <pure.logic@...us-software.ie>
>> Cc: Johan Hovold <johan@...nel.org>
>> Cc: Alex Elder <elder@...nel.org>
>> Cc: greybus-dev@...ts.linaro.org
>> Cc: devel@...verdev.osuosl.org
>> Signed-off-by: Kees Cook <keescook@...omium.org>
>> ---
>>   drivers/staging/greybus/loopback.c  | 14 ++++----------
>>   drivers/staging/greybus/operation.c |  7 +++----
>>   2 files changed, 7 insertions(+), 14 deletions(-)
>>
>> diff --git a/drivers/staging/greybus/loopback.c 
>> b/drivers/staging/greybus/loopback.c
>> index 08e255884206..045aaf81113a 100644
>> --- a/drivers/staging/greybus/loopback.c
>> +++ b/drivers/staging/greybus/loopback.c
>> @@ -572,16 +572,11 @@ static void 
>> gb_loopback_async_operation_work(struct work_struct *work)
>>       gb_loopback_async_operation_put(op_async);
>>   }
>> -static void gb_loopback_async_operation_timeout(unsigned long data)
>> +static void gb_loopback_async_operation_timeout(struct timer_list *t)
>>   {
>> -    struct gb_loopback_async_operation *op_async;
>> -    u16 id = data;
>> +    struct gb_loopback_async_operation *op_async =
>> +        from_timer(op_async, t, timer);
>> -    op_async = gb_loopback_operation_find(id);
>> -    if (!op_async) {
>> -        pr_err("operation %d not found - time out ?\n", id);
>> -        return;
>> -    }
> 
> Hi Kees, you need to add
> 
>      gb_loopback_async_operation_get(op_async); when dropping the 
> gb_loopback_operation_find() call here.

Actually:

	spin_lock_irqsave(&gb_dev.lock, flags);
	gb_loopback_async_operation_get(op_async);
         spin_unlock_irqrestore(&gb_dev.lock, flags);

---
bod