From: Jonathan Cameron <jic23@kernel.org>
To: Alexandru Ardelean <alexandru.ardelean@analog.com>
Cc: <linux-iio@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
<linux-kernel@vger.kernel.org>, <ludovic.desroches@microchip.com>,
<eugen.hristev@microchip.com>, <nicolas.ferre@microchip.com>,
<alexandre.belloni@bootlin.com>, <alexandre.torgue@st.com>,
<mcoquelin.stm32@gmail.com>, <ak@it-klinger.de>
Subject: Re: [PATCH v2 1/8] iio: proximity: ping: pass reference to IIO device via call-stack
Date: Sat, 16 May 2020 18:12:44 +0100 [thread overview]
Message-ID: <20200516181244.4d22c60b@archlinux> (raw)
In-Reply-To: <20200514131710.84201-2-alexandru.ardelean@analog.com>
On Thu, 14 May 2020 16:17:03 +0300
Alexandru Ardelean <alexandru.ardelean@analog.com> wrote:
> 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@analog.com>
Patch makes sense and I should have spotted this one during original
review :( Going backwards and forwards is never a good idea even without
the rework you have.
But... (you knew that was coming :), there is no need to pass
data to the the read function. It is the structure returned by
iio_priv() and not used anywhere else in the read_raw callback.
So might as well just pass the iio_dev and get the data structure
with in the read function via iio_priv(indio_dev)
Thanks,
J
> ---
> 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;
next prev parent reply other threads:[~2020-05-16 17:13 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-14 13:17 [PATCH v2 0/8] iio: core: wrap IIO device into an iio_dev_opaque object Alexandru Ardelean
2020-05-14 13:17 ` [PATCH v2 1/8] iio: proximity: ping: pass reference to IIO device via call-stack Alexandru Ardelean
2020-05-16 17:12 ` Jonathan Cameron [this message]
2020-05-14 13:17 ` [PATCH v2 2/8] iio: at91-sama5d2_adc: pass ref to IIO device via param for int function Alexandru Ardelean
2020-05-16 17:15 ` Jonathan Cameron
2020-05-14 13:17 ` [PATCH v2 3/8] iio: at91_adc: " Alexandru Ardelean
2020-05-16 17:17 ` Jonathan Cameron
2020-05-18 8:32 ` Ardelean, Alexandru
2020-05-21 18:19 ` Jonathan Cameron
2020-05-14 13:17 ` [PATCH v2 4/8] iio: stm32-dfsdm-adc: pass iio device as arg for the interrupt handler Alexandru Ardelean
2020-05-16 17:20 ` Jonathan Cameron
2020-05-14 13:17 ` [PATCH v2 5/8] iio: stm32-adc: " Alexandru Ardelean
2020-05-16 17:21 ` Jonathan Cameron
2020-05-14 13:17 ` [PATCH v2 6/8] iio: core: wrap IIO device into an iio_dev_opaque object Alexandru Ardelean
2020-05-16 17:28 ` Jonathan Cameron
2020-05-14 13:17 ` [PATCH v2 7/8] iio: core: simplify alloc alignment code Alexandru Ardelean
2020-05-15 7:12 ` Sa, Nuno
2020-05-15 11:47 ` Ardelean, Alexandru
2020-05-15 12:37 ` Sa, Nuno
2020-05-16 17:30 ` Jonathan Cameron
2020-05-14 13:17 ` [PATCH v2 8/8] iio: core: move debugfs data on the private iio dev info Alexandru Ardelean
2020-05-22 6:58 ` [PATCH v2 0/8] iio: core: wrap IIO device into an iio_dev_opaque object Ardelean, Alexandru
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