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Re: [PATCH 10/19] gpio: ws16c48: make use of raw_spinlock variants

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  Re: [PATCH 10/19] gpio: ws16c48: make use of raw_spinlock variants Linus Walleij <linus.walleij@linaro.org> - 2017-03-15 11:10 +0100

#1601212 — Re: [PATCH 10/19] gpio: ws16c48: make use of raw_spinlock variants

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

> The ws16c48 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@ni.com>

Patch applied with William's ACK.

Yours,
Linus Walleij

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