From: William Breathitt Gray <vilhelm.gray@gmail.com>
To: David Lechner <david@lechnology.com>
Cc: kamel.bouhara@bootlin.com, gwendal@chromium.org,
alexandre.torgue@st.com, linux-iio@vger.kernel.org,
patrick.havelange@essensium.com, alexandre.belloni@bootlin.com,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, mcoquelin.stm32@gmail.com,
syednwaris@gmail.com, linux-stm32@st-md-mailman.stormreply.com,
jic23@kernel.org
Subject: Re: [PATCH v5 5/5] counter: 104-quad-8: Add IRQ support for the ACCES 104-QUAD-8
Date: Sun, 18 Oct 2020 10:50:25 -0400 [thread overview]
Message-ID: <20201018145025.GC231549@shinobu> (raw)
In-Reply-To: <a0e54a35-eed6-a938-dd4e-4f602d3b50c0@lechnology.com>
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On Tue, Oct 13, 2020 at 07:13:32PM -0500, David Lechner wrote:
> On 9/26/20 9:18 PM, William Breathitt Gray wrote:
> > +static irqreturn_t quad8_irq_handler(int irq, void *quad8iio)
> > +{
> > + struct quad8_iio *const priv = quad8iio;
> > + const unsigned long base = priv->base;
> > + unsigned long irq_status;
> > + unsigned long channel;
> > + u8 event;
> > + int err;
> > +
> > + irq_status = inb(base + QUAD8_REG_INTERRUPT_STATUS);
> > + if (!irq_status)
> > + return IRQ_NONE;
> > +
> > + for_each_set_bit(channel, &irq_status, QUAD8_NUM_COUNTERS) {
> > + switch (priv->irq_trigger[channel]) {
> > + case 0:
> > + event = COUNTER_EVENT_OVERFLOW;
> > + break;
> > + case 1:
> > + event = COUNTER_EVENT_THRESHOLD;
> > + break;
> > + case 2:
> > + event = COUNTER_EVENT_OVERFLOW_UNDERFLOW;
> > + break;
> > + case 3:
> > + event = COUNTER_EVENT_INDEX;
> > + break;
> > + default:
> > + /* We should never reach here */
> > + return -EINVAL;
>
> This is not a valid return value for an IRQ handler. Maybe WARN_ONCE instead?
Ack.
> > + }
> > + err = counter_push_event(&priv->counter, event, channel);
> > + if (err)
> > + return err;
>
> Same here. Otherwise, I think we could end up with interrupts in an endless
> loop since the interrupt would never be cleared.
Good point, I'll change this and the one above.
William Breathitt Gray
> > + }
> > +
> > + /* Clear pending interrupts on device */
> > + outb(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, base + QUAD8_REG_CHAN_OP);
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
>
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next prev parent reply other threads:[~2020-10-18 14:51 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-27 2:18 [PATCH v5 0/5] Introduce the Counter character device interface William Breathitt Gray
2020-09-27 2:18 ` [PATCH v5 2/5] docs: counter: Update to reflect sysfs internalization William Breathitt Gray
2020-09-27 2:18 ` [PATCH v5 3/5] counter: Add character device interface William Breathitt Gray
2020-10-14 1:40 ` David Lechner
2020-10-18 16:49 ` William Breathitt Gray
2020-10-20 15:53 ` David Lechner
2020-10-25 12:55 ` William Breathitt Gray
2020-10-25 16:36 ` David Lechner
2020-10-14 17:43 ` David Lechner
2020-10-14 19:05 ` William Breathitt Gray
2020-10-14 22:32 ` David Lechner
2020-10-14 22:40 ` David Lechner
2020-10-18 16:58 ` William Breathitt Gray
2020-10-20 16:06 ` David Lechner
2020-10-25 13:18 ` William Breathitt Gray
2020-10-25 16:34 ` David Lechner
2020-10-25 17:53 ` William Breathitt Gray
2020-09-27 2:18 ` [PATCH v5 4/5] docs: counter: Document " William Breathitt Gray
2020-10-08 8:09 ` Pavel Machek
2020-10-08 12:28 ` William Breathitt Gray
2020-10-12 17:04 ` David Lechner
2020-10-13 18:58 ` William Breathitt Gray
2020-10-13 19:08 ` David Lechner
2020-10-13 19:27 ` William Breathitt Gray
2020-09-27 2:18 ` [PATCH v5 5/5] counter: 104-quad-8: Add IRQ support for the ACCES 104-QUAD-8 William Breathitt Gray
2020-10-14 0:13 ` David Lechner
2020-10-18 14:50 ` William Breathitt Gray [this message]
2020-10-13 0:35 ` [PATCH v5 0/5] Introduce the Counter character device interface David Lechner
2020-10-18 14:14 ` William Breathitt Gray
[not found] ` <e38f6dc3a08bf2510034334262776a6ed1df8b89.1601170670.git.vilhelm.gray@gmail.com>
2020-10-13 2:15 ` [PATCH v5 1/5] counter: Internalize sysfs interface code David Lechner
2020-10-18 14:49 ` William Breathitt Gray
2020-10-20 15:38 ` David Lechner
2020-10-23 13:12 ` William Breathitt Gray
2020-10-15 1:38 ` David Lechner
2020-10-18 17:00 ` William Breathitt Gray
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