Re: [PATCH v2 1/2] leds: Add support for Palmas LEDs

From: Bryan Wu
Date: Tue Mar 12 2013 - 17:16:12 EST

On Tue, Mar 12, 2013 at 12:10 PM, Mark Brown
<broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> On Tue, Mar 12, 2013 at 11:57:50AM -0700, Bryan Wu wrote:
>> On Thu, Feb 28, 2013 at 7:21 AM, Ian Lartey <ian@xxxxxxxxxxxxxxx> wrote:
>> > + spinlock_t value_lock;
>> I think you don't need this spinlock to protect the value, the mutex is enough.
> You need to use a spinlock because values can be set from hard IRQ
> context so you can't take a mutex there. Someone should really factor
> this out into the framework in their copious free time, the set and
> schedule pattern is very common in drivers.

Ah, exactly. I think I provided a patch before to add those schedule
workqueue stuff into the leds frameworks. But don't have time to
update it according to the review.

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