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| From | Linus Walleij <linus.walleij@linaro.org> |
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 09/19] gpio: pl061: make use of raw_spinlock variants |
| Date | Wed, 15 Mar 2017 11:10:02 +0100 |
| Message-ID | <tle2u-689-19@gated-at.bofh.it> (permalink) |
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| X-Original-Cc | Alexandre Courbot <gnurou@gmail.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Thomas Gleixner <tglx@linutronix.de>, "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org> |
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On Thu, Mar 9, 2017 at 5:21 PM, Julia Cartwright <julia@ni.com> wrote: > The pl061 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. Yours, Linus Walleij
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Re: [PATCH 09/19] gpio: pl061: make use of raw_spinlock variants Linus Walleij <linus.walleij@linaro.org> - 2017-03-15 11:10 +0100
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