linux-kernel - [PATCH v2 1/8] iio: proximity: ping: pass reference to IIO device via call-stack

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Date:   Thu, 14 May 2020 16:17:03 +0300
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-iio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-kernel@...r.kernel.org>
CC:     <ludovic.desroches@...rochip.com>, <eugen.hristev@...rochip.com>,
        <jic23@...nel.org>, <nicolas.ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <alexandre.torgue@...com>,
        <mcoquelin.stm32@...il.com>, <ak@...klinger.de>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH v2 1/8] iio: proximity: ping: pass reference to IIO device via call-stack

Since there will be some changes to how iio_priv_to_dev() is implemented,
it could be that the helper becomes a bit slower, as it will be hidden away
in the IIO core.

For this driver, the IIO device can be passed directly as a parameter to
the ping_read() function, thus making it immune to the change of
iio_priv_to_dev().

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 drivers/iio/proximity/ping.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/proximity/ping.c b/drivers/iio/proximity/ping.c
index 12b893c5b0ee..ddc43a5a2ef8 100644
--- a/drivers/iio/proximity/ping.c
+++ b/drivers/iio/proximity/ping.c
@@ -89,14 +89,13 @@ static irqreturn_t ping_handle_irq(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static int ping_read(struct ping_data *data)
+static int ping_read(struct iio_dev *indio_dev, struct ping_data *data)
 {
 	int ret;
 	ktime_t ktime_dt;
 	s64 dt_ns;
 	u32 time_ns, distance_mm;
 	struct platform_device *pdev = to_platform_device(data->dev);
-	struct iio_dev *indio_dev = iio_priv_to_dev(data);
 
 	/*
 	 * just one read-echo-cycle can take place at a time
@@ -236,7 +235,7 @@ static int ping_read_raw(struct iio_dev *indio_dev,
 
 	switch (info) {
 	case IIO_CHAN_INFO_RAW:
-		ret = ping_read(data);
+		ret = ping_read(indio_dev, data);
 		if (ret < 0)
 			return ret;
 		*val = ret;
-- 
2.17.1