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Message-ID: <d8cddce3-c353-e8e9-9221-84eed6d28b69@redhat.com>
Date: Sat, 16 Apr 2022 08:49:13 -0700
From: Tom Rix <trix@...hat.com>
To: 郭力豪 <lhjeff911@...il.com>
Cc: Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
linux-kernel@...r.kernel.org,
呂芳騰LuWells <wells.lu@...plus.com>,
"lh.kuo" <lh.kuo@...plus.com>, nathan@...nel.org
Subject: Re: [PATCH] spi: remove spin_lock_irq in the irq procress
On 4/14/22 6:16 AM, 郭力豪 wrote:
> Hi Tom :
>
> This SPI driver only handles one transfer at a time.
> That's why locks are not needed.
Please add this statement to the commit log.
In a commit log, not only do I look for what was changed but also why
the change was made.
Tom
>
>
> Li-hao Kuo
>
> Tom Rix <trix@...hat.com> 於 2022年4月13日 週三 下午7:45寫道:
>>
>> On 4/12/22 6:38 PM, Li-hao Kuo wrote:
>>> - remove spin_lock_irq and spin_unlock_irq in the irq funciton
>> function
>>
>> I was expecting a statement on why is the lock is not needed.
>>
>> Could you add one ?
>>
>> Tom
>>
>>> Signed-off-by: Li-hao Kuo <lhjeff911@...il.com>
>>> ---
>>> drivers/spi/spi-sunplus-sp7021.c | 4 +---
>>> 1 file changed, 1 insertion(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/spi/spi-sunplus-sp7021.c b/drivers/spi/spi-sunplus-sp7021.c
>>> index f989f7b..120623c 100644
>>> --- a/drivers/spi/spi-sunplus-sp7021.c
>>> +++ b/drivers/spi/spi-sunplus-sp7021.c
>>> @@ -199,8 +199,6 @@ static irqreturn_t sp7021_spi_master_irq(int irq, void *dev)
>>> if (tx_len == 0 && total_len == 0)
>>> return IRQ_NONE;
>>>
>>> - spin_lock_irq(&pspim->lock);
>>> -
>>> rx_cnt = FIELD_GET(SP7021_RX_CNT_MASK, fd_status);
>>> if (fd_status & SP7021_RX_FULL_FLAG)
>>> rx_cnt = pspim->data_unit;
>>> @@ -239,7 +237,7 @@ static irqreturn_t sp7021_spi_master_irq(int irq, void *dev)
>>>
>>> if (isrdone)
>>> complete(&pspim->isr_done);
>>> - spin_unlock_irq(&pspim->lock);
>>> +
>>> return IRQ_HANDLED;
>>> }
>>>
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