Messages in this thread | | | Date | Thu, 30 Apr 2015 11:07:58 +0200 | From | Johan Hovold <> | Subject | Re: [PATCH 03/23] gpio: sysfs: drop redundant lock-as-irq |
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On Wed, Apr 29, 2015 at 11:48:57PM +0200, Linus Walleij wrote: > On Tue, Apr 21, 2015 at 5:42 PM, Johan Hovold <johan@kernel.org> wrote: > > > Drop redundant lock-as-irq in gpio_setup_irq, which has already been > > handled when requesting and releasing the irq (i.e. in the irq chip > > irq_request_resources and irq_release_resources callbacks). > > Well we would hope they all do that. And I hope for the vast majority > that is true, but there is a TODO to go over all gpiochip drivers > (some which are elsewhere in the kernel than drivers/gpio) and > make sure they actually do so. > > Right now it's a bit arbitrary if so happens, and in not marked by > the driver as IRQ then this kicks in and provides an additional > protection. > > But maybe that's overzealous, what do people say?
No, you're right. The drivers that fail to do this needs to be fixed, but the "redundant" lock-as-irq in the sysfs interface should not be removed before that.
I'll respin the series and add it back with a comment explaining why gpiochip_lock_as_irq is currently called twice.
Thanks, Johan
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