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From: Philippe Schenker <dev@pschenker.ch>
To: linux-iio@vger.kernel.org, Jonathan Cameron <jic23@kernel.org>,
	Stefan Agner <stefan@agner.ch>, Hartmut Knaack <knaack.h@gmx.de>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Marcel Ziswiler <marcel.ziswiler@toradex.com>,
	David Laight <David.Laight@ACULAB.COM>,
	dev@pschenker.ch,
	Philippe Schenker <philippe.schenker@toradex.com>,
	Max Krummenacher <max.krummenacher@toradex.com>,
	Alexandre Torgue <alexandre.torgue@st.com>,
	linux-kernel@vger.kernel.org, Lee Jones <lee.jones@linaro.org>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/5] iio: stmpe-adc: Reinit completion struct on begin conversion
Date: Tue,  7 May 2019 16:36:12 +0200	[thread overview]
Message-ID: <20190507143615.28477-2-dev@pschenker.ch> (raw)
In-Reply-To: <20190507143615.28477-1-dev@pschenker.ch>

From: Philippe Schenker <philippe.schenker@toradex.com>

In some cases, the wait_completion got interrupted. This caused the
error-handling to mutex_unlock the function. The before turned on
interrupt then got called anyway. In the ISR then completion() was
called causing wrong adc-values returned in a following adc-readout.

Reinitialise completion struct to make sure the counter is zero
when beginning a new adc-conversion.

Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
---

 drivers/iio/adc/stmpe-adc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/iio/adc/stmpe-adc.c b/drivers/iio/adc/stmpe-adc.c
index 9ec338ba3440..b3872eb37293 100644
--- a/drivers/iio/adc/stmpe-adc.c
+++ b/drivers/iio/adc/stmpe-adc.c
@@ -65,6 +65,8 @@ static int stmpe_read_voltage(struct stmpe_adc *info,
 
 	mutex_lock(&info->lock);
 
+	reinit_completion(&info->completion);
+
 	info->channel = (u8)chan->channel;
 
 	if (info->channel > STMPE_ADC_LAST_NR) {
@@ -105,6 +107,8 @@ static int stmpe_read_temp(struct stmpe_adc *info,
 
 	mutex_lock(&info->lock);
 
+	reinit_completion(&info->completion);
+
 	info->channel = (u8)chan->channel;
 
 	if (info->channel != STMPE_TEMP_CHANNEL) {
-- 
2.21.0


WARNING: multiple messages have this Message-ID (diff)
From: Philippe Schenker <dev@pschenker.ch>
To: linux-iio@vger.kernel.org, Jonathan Cameron <jic23@kernel.org>,
	Stefan Agner <stefan@agner.ch>, Hartmut Knaack <knaack.h@gmx.de>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre Torgue <alexandre.torgue@st.com>,
	Marcel Ziswiler <marcel.ziswiler@toradex.com>,
	linux-kernel@vger.kernel.org,
	linux-stm32@st-md-mailman.stormreply.com,
	Philippe Schenker <philippe.schenker@toradex.com>,
	David Laight <David.Laight@ACULAB.COM>,
	Max Krummenacher <max.krummenacher@toradex.com>,
	Lee Jones <lee.jones@linaro.org>,
	dev@pschenker.ch, linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/5] iio: stmpe-adc: Reinit completion struct on begin conversion
Date: Tue,  7 May 2019 16:36:12 +0200	[thread overview]
Message-ID: <20190507143615.28477-2-dev@pschenker.ch> (raw)
In-Reply-To: <20190507143615.28477-1-dev@pschenker.ch>

From: Philippe Schenker <philippe.schenker@toradex.com>

In some cases, the wait_completion got interrupted. This caused the
error-handling to mutex_unlock the function. The before turned on
interrupt then got called anyway. In the ISR then completion() was
called causing wrong adc-values returned in a following adc-readout.

Reinitialise completion struct to make sure the counter is zero
when beginning a new adc-conversion.

Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
---

 drivers/iio/adc/stmpe-adc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/iio/adc/stmpe-adc.c b/drivers/iio/adc/stmpe-adc.c
index 9ec338ba3440..b3872eb37293 100644
--- a/drivers/iio/adc/stmpe-adc.c
+++ b/drivers/iio/adc/stmpe-adc.c
@@ -65,6 +65,8 @@ static int stmpe_read_voltage(struct stmpe_adc *info,
 
 	mutex_lock(&info->lock);
 
+	reinit_completion(&info->completion);
+
 	info->channel = (u8)chan->channel;
 
 	if (info->channel > STMPE_ADC_LAST_NR) {
@@ -105,6 +107,8 @@ static int stmpe_read_temp(struct stmpe_adc *info,
 
 	mutex_lock(&info->lock);
 
+	reinit_completion(&info->completion);
+
 	info->channel = (u8)chan->channel;
 
 	if (info->channel != STMPE_TEMP_CHANNEL) {
-- 
2.21.0


_______________________________________________
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2019-05-07 14:36 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-07 14:36 [PATCH 1/5] iio: stmpe-adc: Add compatible name Philippe Schenker
2019-05-07 14:36 ` Philippe Schenker
2019-05-07 14:36 ` Philippe Schenker [this message]
2019-05-07 14:36   ` [PATCH 2/5] iio: stmpe-adc: Reinit completion struct on begin conversion Philippe Schenker
2019-05-11 10:08   ` Jonathan Cameron
2019-05-11 10:08     ` Jonathan Cameron
2019-05-13  7:26     ` Philippe Schenker
2019-05-13  7:26       ` Philippe Schenker
2019-05-07 14:36 ` [PATCH 3/5] iio: stmpe-adc: Enable all stmpe-adc interrupts just once Philippe Schenker
2019-05-07 14:36   ` Philippe Schenker
2019-05-11 10:09   ` Jonathan Cameron
2019-05-11 10:09     ` Jonathan Cameron
2019-05-07 14:36 ` [PATCH 4/5] iio: stmpe-adc: Use wait_for_completion_timeout Philippe Schenker
2019-05-07 14:36   ` Philippe Schenker
2019-05-11 10:15   ` Jonathan Cameron
2019-05-11 10:15     ` Jonathan Cameron
2019-05-13  7:28     ` Philippe Schenker
2019-05-13  7:28       ` Philippe Schenker
2019-05-07 14:36 ` [PATCH 5/5] iio: stmpe-adc: Reset possible interrupts Philippe Schenker
2019-05-07 14:36   ` Philippe Schenker
2019-05-11 10:24   ` Jonathan Cameron
2019-05-11 10:24     ` Jonathan Cameron
2019-05-13  7:47     ` Philippe Schenker
2019-05-13  7:47       ` Philippe Schenker
2019-05-08  7:01 ` [PATCH 1/5] iio: stmpe-adc: Add compatible name Lee Jones
2019-05-08  7:01   ` Lee Jones
2019-05-08  7:28   ` Philippe Schenker
2019-05-08  7:28     ` Philippe Schenker
2019-05-11  9:58 ` Jonathan Cameron
2019-05-11  9:58   ` Jonathan Cameron

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