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From: Eugen Hristev <eugen.hristev@microchip.com>
To: <jic23@kernel.org>, <ludovic.desroches@microchip.com>,
	<alexandre.belloni@bootlin.com>,
	<linux-arm-kernel@lists.infradead.org>,
	<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-iio@vger.kernel.org>, <linux-input@vger.kernel.org>,
	<nicolas.ferre@microchip.com>, <dmitry.torokhov@gmail.com>,
	<robh@kernel.org>
Cc: Eugen Hristev <eugen.hristev@microchip.com>
Subject: [PATCH v3 06/11] iio: inkern: add module put/get on iio dev module when requesting channels
Date: Tue, 10 Apr 2018 11:57:52 +0300	[thread overview]
Message-ID: <1523350677-27106-7-git-send-email-eugen.hristev@microchip.com> (raw)
In-Reply-To: <1523350677-27106-1-git-send-email-eugen.hristev@microchip.com>

When requesting channels for a particular consumer device,
besides requesting the device (incrementing the reference counter), also
do it for the driver module of the iio dev. This will avoid the situation
where the producer IIO device can be removed and the consumer is still
present in the kernel.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
---
 drivers/iio/inkern.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index ec98790..68d9b87 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -11,6 +11,7 @@
 #include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
+#include <linux/module.h>
 
 #include <linux/iio/iio.h>
 #include "iio_core.h"
@@ -152,6 +153,7 @@ static int __of_iio_channel_get(struct iio_channel *channel,
 	if (index < 0)
 		goto err_put;
 	channel->channel = &indio_dev->channels[index];
+	try_module_get(channel->indio_dev->driver_module);
 
 	return 0;
 
@@ -256,8 +258,10 @@ static struct iio_channel *of_iio_channel_get_all(struct device *dev)
 	return chans;
 
 error_free_chans:
-	for (i = 0; i < mapind; i++)
+	for (i = 0; i < mapind; i++) {
+		module_put(chans[i].indio_dev->driver_module);
 		iio_device_put(chans[i].indio_dev);
+	}
 	kfree(chans);
 	return ERR_PTR(ret);
 }
@@ -351,6 +355,7 @@ void iio_channel_release(struct iio_channel *channel)
 {
 	if (!channel)
 		return;
+	module_put(channel->indio_dev->driver_module);
 	iio_device_put(channel->indio_dev);
 	kfree(channel);
 }
@@ -482,6 +487,7 @@ void iio_channel_release_all(struct iio_channel *channels)
 	struct iio_channel *chan = &channels[0];
 
 	while (chan->indio_dev) {
+		module_put(chan->indio_dev->driver_module);
 		iio_device_put(chan->indio_dev);
 		chan++;
 	}
-- 
2.7.4

  parent reply	other threads:[~2018-04-10  9:10 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-10  8:57 [PATCH v3 00/11] Add support for SAMA5D2 touchscreen Eugen Hristev
2018-04-10  8:57 ` [PATCH v3 01/11] iio: adc: at91-sama5d2_adc: fix channel configuration for differential channels Eugen Hristev
2018-04-15 19:23   ` Jonathan Cameron
2018-04-10  8:57 ` [PATCH v3 02/11] MAINTAINERS: add generic resistive touchscreen adc Eugen Hristev
2018-04-10  8:57 ` [PATCH v3 03/11] iio: Add channel for Position Relative Eugen Hristev
2018-04-15 19:29   ` Jonathan Cameron
2018-04-17  7:30     ` Eugen Hristev
2018-04-18  9:32       ` Jonathan Cameron
2018-04-10  8:57 ` [PATCH v3 04/11] dt-bindings: input: touchscreen: add pressure threshold touchscreen property Eugen Hristev
2018-04-13 18:33   ` Rob Herring
2018-04-10  8:57 ` [PATCH v3 05/11] dt-bindings: input: touchscreen: resistive-adc-touch: create bindings Eugen Hristev
2018-04-13 18:34   ` Rob Herring
2018-04-10  8:57 ` Eugen Hristev [this message]
2018-04-15 19:33   ` [PATCH v3 06/11] iio: inkern: add module put/get on iio dev module when requesting channels Jonathan Cameron
2018-04-16 23:58     ` Dmitry Torokhov
2018-04-17  7:39       ` Eugen Hristev
2018-04-17 19:19         ` Dmitry Torokhov
2018-04-18  9:35           ` Jonathan Cameron
2018-04-18 12:37             ` Lars-Peter Clausen
2018-04-10  8:57 ` [PATCH v3 07/11] iio: adc: at91-sama5d2_adc: add support for position and pressure channels Eugen Hristev
2018-04-15 19:45   ` Jonathan Cameron
2018-04-10  8:57 ` [PATCH v3 08/11] input: touchscreen: resistive-adc-touch: add generic resistive ADC touchscreen Eugen Hristev
2018-04-23 23:22   ` Dmitry Torokhov
2018-04-23 23:24     ` Dmitry Torokhov
2018-04-10  8:57 ` [PATCH v3 09/11] dt-bindings: iio: adc: at91-sama5d2_adc: add channel specific consumer info Eugen Hristev
2018-04-10  8:57 ` [PATCH v3 10/11] ARM: dts: at91: sama5d2: add channel cells for ADC device Eugen Hristev
2018-04-10  8:57 ` [PATCH v3 11/11] ARM: dts: at91: sama5d2: Add resistive touch device Eugen Hristev

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