From: Maxime Ripard <maxime.ripard@free-electrons.com>
To: Hans de Goede <hdegoede@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
linux-arm-kernel@lists.infradead.org,
devicetree <devicetree@vger.kernel.org>,
linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com
Subject: Re: [PATCH v2 2/2] irqchip: sun4i: simplify sun4i_irq_ack
Date: Mon, 17 Mar 2014 12:12:45 +0100 [thread overview]
Message-ID: <20140317111245.GH27873@lukather> (raw)
In-Reply-To: <1394895894-8891-3-git-send-email-hdegoede@redhat.com>
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On Sat, Mar 15, 2014 at 04:04:54PM +0100, Hans de Goede wrote:
> Now that we only ack irq 0 the code can be simplified a lot.
>
> Also switch from read / modify / write to a simple write clear:
> 1) This is what the android code does (it has a hack for acking irq 0
> in its unmask code doing this)
> 2) read / modify / write simply does not make sense for an irq status
> register like this, if the other bits are writeable (and the data sheet says
> they are not) they should be write 1 to clear, since otherwise a read /
> modify / write can race with a device raising an interrupt and then clear
> the pending bit unintentionally
>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Thanks!
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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next prev parent reply other threads:[~2014-03-17 11:15 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-15 15:04 [PATCH v2 0/2] irqchip: sun4i: Use handle_fasteoi_irq for all irqs Hans de Goede
2014-03-15 15:04 ` [PATCH v2 1/2] irqchip: sun4i: Use handle_fasteoi_irq for all interrupts Hans de Goede
2014-03-17 11:12 ` Maxime Ripard
2014-03-19 11:36 ` [tip:irq/core] " tip-bot for Hans de Goede
2014-03-15 15:04 ` [PATCH v2 2/2] irqchip: sun4i: simplify sun4i_irq_ack Hans de Goede
2014-03-17 11:12 ` Maxime Ripard [this message]
2014-03-19 11:36 ` [tip:irq/core] irqchip: sun4i: Simplify sun4i_irq_ack tip-bot for Hans de Goede
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