linux-kernel - [PATCH 4.14 128/315] iio: adc: vf610: Fix buffer alignment in iio_push_to_buffers_with

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Message-Id: <20210719144947.097001818@linuxfoundation.org>
Date:   Mon, 19 Jul 2021 16:50:17 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Stefan-Gabriel Mirea <stefan-gabriel.mirea@....com>,
        Sanchayan Maity <maitysanchayan@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 128/315] iio: adc: vf610: Fix buffer alignment in iio_push_to_buffers_with_timestamp()

From: Jonathan Cameron <Jonathan.Cameron@...wei.com>

[ Upstream commit 7765dfaa22ea08abf0c175e7553826ba2a939632 ]

To make code more readable, use a structure to express the channel
layout and ensure the timestamp is 8 byte aligned.

Found during an audit of all calls of uses of
iio_push_to_buffers_with_timestamp()

Fixes: 0010d6b44406 ("iio: adc: vf610: Add IIO buffer support for Vybrid ADC")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Stefan-Gabriel Mirea <stefan-gabriel.mirea@....com>
Cc: Sanchayan Maity <maitysanchayan@...il.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Link: https://lore.kernel.org/r/20210501170121.512209-10-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/adc/vf610_adc.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/adc/vf610_adc.c b/drivers/iio/adc/vf610_adc.c
index c168e0db329a..d4409366e3c6 100644
--- a/drivers/iio/adc/vf610_adc.c
+++ b/drivers/iio/adc/vf610_adc.c
@@ -180,7 +180,11 @@ struct vf610_adc {
 	u32 sample_freq_avail[5];
 
 	struct completion completion;
-	u16 buffer[8];
+	/* Ensure the timestamp is naturally aligned */
+	struct {
+		u16 chan;
+		s64 timestamp __aligned(8);
+	} scan;
 };
 
 static const u32 vf610_hw_avgs[] = { 1, 4, 8, 16, 32 };
@@ -592,9 +596,9 @@ static irqreturn_t vf610_adc_isr(int irq, void *dev_id)
 	if (coco & VF610_ADC_HS_COCO0) {
 		info->value = vf610_adc_read_data(info);
 		if (iio_buffer_enabled(indio_dev)) {
-			info->buffer[0] = info->value;
+			info->scan.chan = info->value;
 			iio_push_to_buffers_with_timestamp(indio_dev,
-					info->buffer,
+					&info->scan,
 					iio_get_time_ns(indio_dev));
 			iio_trigger_notify_done(indio_dev->trig);
 		} else
-- 
2.30.2