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From:   Daniel Campello <campello@chromium.org>
To:     LKML <devicetree@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>
Cc:     Jonathan Cameron <jic23@kernel.org>,
        Daniel Campello <campello@chromium.org>,
        Stephen Boyd <swboyd@chromium.org>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Douglas Anderson <dianders@chromium.org>,
        Enrico Granata <egranata@chromium.org>,
        Hartmut Knaack <knaack.h@gmx.de>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
        linux-iio@vger.kernel.org
Subject: [PATCH v4 03/15] iio: sx9310: Fix irq handling
Date:   Mon,  3 Aug 2020 17:41:42 -0600
Message-Id: <20200803131544.v4.3.Idbfcd2e92d2fd89b6ed2e83211bd3e6c06852c33@changeid>
In-Reply-To: <20200803234154.320400-1-campello@chromium.org>
References: <20200803234154.320400-1-campello@chromium.org>
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Fixes enable/disable irq handling at various points. The driver needs to
only enable/disable irqs if there is an actual irq handler installed.

Signed-off-by: Daniel Campello <campello@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
---

Changes in v4:
 - Reverted condition check logic on enable/disable_irq methods.

Changes in v3:
 - Moved irq presence check down to lower methods

Changes in v2:
 - Reordered error handling on sx9310_resume()

 drivers/iio/proximity/sx9310.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
index 69db4cefe49f2a..3523ee5c8f0d2d 100644
--- a/drivers/iio/proximity/sx9310.c
+++ b/drivers/iio/proximity/sx9310.c
@@ -322,11 +322,15 @@ static int sx9310_put_event_channel(struct sx9310_data *data, int channel)
 
 static int sx9310_enable_irq(struct sx9310_data *data, unsigned int irq)
 {
+	if (!data->client->irq)
+		return 0;
 	return regmap_update_bits(data->regmap, SX9310_REG_IRQ_MSK, irq, irq);
 }
 
 static int sx9310_disable_irq(struct sx9310_data *data, unsigned int irq)
 {
+	if (!data->client->irq)
+		return 0;
 	return regmap_update_bits(data->regmap, SX9310_REG_IRQ_MSK, irq, 0);
 }
 
@@ -380,7 +384,7 @@ static int sx9310_read_proximity(struct sx9310_data *data,
 
 	mutex_unlock(&data->mutex);
 
-	if (data->client->irq > 0) {
+	if (data->client->irq) {
 		ret = wait_for_completion_interruptible(&data->completion);
 		reinit_completion(&data->completion);
 	} else {
@@ -1009,10 +1013,11 @@ static int __maybe_unused sx9310_resume(struct device *dev)
 
 out:
 	mutex_unlock(&data->mutex);
+	if (ret)
+		return ret;
 
 	enable_irq(data->client->irq);
-
-	return ret;
+	return 0;
 }
 
 static const struct dev_pm_ops sx9310_pm_ops = {
-- 
2.28.0.163.g6104cc2f0b6-goog