[PATCH 16/19] pinctrl: bcm: make use of raw_spinlock variants
linus.walleij at linaro.org
Wed Mar 15 03:11:42 PDT 2017
On Thu, Mar 9, 2017 at 5:22 PM, Julia Cartwright <julia at ni.com> wrote:
> The bcm pinctrl drivers currently implement 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 at ni.com>
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