linux-kernel - Re: [PATCH 02/19] gpio: altera: make use of raw

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Message-ID: <CACRpkdYFQT1RNhnONGHbwZ1uBKPhoEnfhZH5f1vAeUeJdDbGrA@mail.gmail.com>
Date:   Wed, 15 Mar 2017 10:53:23 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Julia Cartwright <julia@...com>
Cc:     Tien Hock Loh <thloh@...era.com>,
        Alexandre Courbot <gnurou@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH 02/19] gpio: altera: make use of raw_spinlock variants

On Thu, Mar 9, 2017 at 5:21 PM, Julia Cartwright <julia@...com> wrote:

> The altera gpio driver currently implements an irq_chip for handling
> interrupts; due to how irq_chip handling is done, it's necessary for the
> irq_chip methods to be invoked from hardirq context, even on a a real-time
> kernel.  Because the spinlock_t type becomes a "sleeping" spinlock w/ RT
> kernels, it is not suitable to be used with irq_chips.
>
> A quick audit of the operations under the lock reveal that they do only
> minimal, bounded work, and are therefore safe to do under a raw spinlock.
>
> Signed-off-by: Julia Cartwright <julia@...com>

Patch applied.

Yours,
Linus Walleij