From: Grygorii Strashko <grygorii.strashko@ti.com>
To: Arnd Bergmann <arnd@kernel.org>
Cc: Luo Jiaxing <luojiaxing@huawei.com>,
Linus Walleij <linus.walleij@linaro.org>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Santosh Shilimkar <ssantosh@kernel.org>,
Kevin Hilman <khilman@kernel.org>,
"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
<linuxarm@openeuler.org>
Subject: Re: [PATCH for next v1 1/2] gpio: omap: Replace raw_spin_lock_irqsave with raw_spin_lock in omap_gpio_irq_handler()
Date: Thu, 11 Feb 2021 22:16:49 +0200 [thread overview]
Message-ID: <d5465b81-bb53-49ee-a556-40d208deb765@ti.com> (raw)
In-Reply-To: <CAK8P3a0m4ocfLyJZ5wMxyKESYUJ5um5sb5MyAzC8ckCb6qAH5g@mail.gmail.com>
On 11/02/2021 21:39, Arnd Bergmann wrote:
> On Thu, Feb 11, 2021 at 7:25 PM Grygorii Strashko
> <grygorii.strashko@ti.com> wrote:
>> On 08/02/2021 10:56, Luo Jiaxing wrote:
>>> There is no need to use API with _irqsave in omap_gpio_irq_handler(),
>>> because it already be in a irq-disabled context.
>>
>> NACK.
>> Who said that this is always hard IRQ handler?
>> What about RT-kernel or boot with "threadirqs"?
>
> In those cases, the interrupt handler is just a normal thread, so the
> preempt_disable() that is implied by raw_spin_lock() is sufficient.
>
> Disabling interrupts inside of an interrupt handler is always incorrect,
> the patch looks like a useful cleanup to me, if only for readability.
Note. there is also generic_handle_irq() call inside.
--
Best regards,
grygorii
next prev parent reply other threads:[~2021-02-11 20:18 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-08 8:56 [PATCH for next v1 0/2] gpio: few clean up patches to replace spin_lock_irqsave with spin_lock Luo Jiaxing
2021-02-08 8:56 ` [PATCH for next v1 1/2] gpio: omap: Replace raw_spin_lock_irqsave with raw_spin_lock in omap_gpio_irq_handler() Luo Jiaxing
2021-02-11 18:14 ` Grygorii Strashko
2021-02-11 19:39 ` Arnd Bergmann
2021-02-11 20:16 ` Grygorii Strashko [this message]
[not found] ` <a61ef337fd1c4538a47fe855920f95d3@hisilicon.com>
[not found] ` <CAK8P3a3SHQNjF5ZpqHQweG7BQ52Xi1hQKDiMVKq4aNK_7VDw6w@mail.gmail.com>
2021-02-12 10:27 ` [Linuxarm] " Grygorii Strashko
2021-02-12 10:42 ` Song Bao Hua (Barry Song)
2021-02-12 10:57 ` Andy Shevchenko
2021-02-12 11:29 ` Song Bao Hua (Barry Song)
2021-02-12 11:53 ` Grygorii Strashko
2021-02-12 13:12 ` Song Bao Hua (Barry Song)
2021-02-12 14:08 ` Grygorii Strashko
2021-02-12 20:06 ` Song Bao Hua (Barry Song)
2021-02-12 20:23 ` Arnd Bergmann
2021-02-12 20:49 ` Song Bao Hua (Barry Song)
2021-02-12 10:59 ` Arnd Bergmann
2021-02-12 11:35 ` Andy Shevchenko
2021-02-08 9:11 ` [Linuxarm] [PATCH for next v1 0/2] gpio: few clean up patches to replace spin_lock_irqsave with spin_lock luojiaxing
2021-02-08 13:28 ` Andy Shevchenko
2021-02-09 9:24 ` luojiaxing
2021-02-09 9:42 ` Andy Shevchenko
2021-02-10 3:43 ` luojiaxing
2021-02-10 10:50 ` Andy Shevchenko
2021-02-10 11:50 ` [Linuxarm] " Song Bao Hua (Barry Song)
2021-02-10 14:56 ` Andy Shevchenko
2021-02-10 20:42 ` Song Bao Hua (Barry Song)
2021-02-11 9:58 ` Andy Shevchenko
-- strict thread matches above, loose matches on Subject: below --
2021-02-08 8:57 Luo Jiaxing
2021-02-08 8:57 ` [PATCH for next v1 1/2] gpio: omap: Replace raw_spin_lock_irqsave with raw_spin_lock in omap_gpio_irq_handler() Luo Jiaxing
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