linux-kernel - Re: [PATCHv2 -next] MFD: MFD module of DA9052 PMIC driver

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Date:	Tue, 3 May 2011 15:44:42 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Ashish Jangam <Ashish.Jangam@...tcummins.com>
Cc:	"sameo@...nedhand.com" <sameo@...nedhand.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dajun Chen <Dajun.Chen@...semi.com>
Subject: Re: [PATCHv2 -next] MFD: MFD module of DA9052 PMIC driver

On Tue, May 03, 2011 at 07:30:54PM +0530, Ashish Jangam wrote:

> +int da9052_unmask_events(struct da9052 *da9052, unsigned int events)
> +{
> +       uint8_t v[4];
> +
> +       da9052->events_mask &= ~events;
> +
> +       v[0] = (da9052->events_mask & 0xff);
> +       v[1] = (da9052->events_mask >> 8) & 0xff;
> +       v[2] = (da9052->events_mask >> 16) & 0xff;
> +       v[3] = (da9052->events_mask >> 24) & 0xff;
> +
> +       return da9052_group_write(da9052, DA9052_IRQ_MASK_A_REG, 4, v);
> +}
> +
> +int da9052_mask_events(struct da9052 *da9052, unsigned int events)
> +{
> +       uint8_t v[4];
> +
> +       da9052->events_mask |= events;
> +
> +       v[0] = (da9052->events_mask & 0xff);
> +       v[1] = (da9052->events_mask >> 8) & 0xff;
> +       v[2] = (da9052->events_mask >> 16) & 0xff;
> +       v[3] = (da9052->events_mask >> 24) & 0xff;
> +
> +       return da9052_group_write(da9052, DA9052_IRQ_MASK_A_REG, 4, v);
> +}

My previous queries about why this is here and not in the IRQ code still
stand.

> +static void da9052_irq_sync_unlock(struct irq_data *data)
> +{
> +       struct da9052 *da9052 = irq_data_get_irq_chip_data(data);
> +       struct da9052_irq_data *irq_data = irq_to_da9052_irq(da9052,
> +                                               data->irq);
> +
> +       da9052_mask_events(da9052, irq_data->event);
> +       mutex_unlock(&da9052->irq_lock);

What happens if an event was enabled while the bus was locked?
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