On Thu, Sep 22, 2016 at 03:10:21PM +0200, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
>
>The patch below does not apply to the 4.7-stable tree.
>If someone wants it applied there, or to any other stable or longterm
>tree, then please email the backport, including the original git commit
>id to <stable@xxxxxxxxxxxxxxx>.
>
>thanks,
>
>greg k-h
This patch fixes an issues introduced in commit 765550e4d98d
("iio: stx104: Add GPIO support for the Apex Embedded Systems STX104").
If I'm not mistaken, commit 765550e4d98d is not in the 4.7-stable tree.
Since the source of the issue is not present, this patch to resolve the
issue should not be merged into 4.7-stable.
Sincerely,
William Breathitt Gray
>------------------ original commit in Linus's tree ------------------
>
>From 45e98152850c36560484f3fa3bb857a4bfe1a419 Mon Sep 17 00:00:00 2001
>From: William Breathitt Gray <vilhelm.gray@xxxxxxxxx>
>Date: Tue, 19 Jul 2016 12:25:00 -0400
>Subject: [PATCH] iio: stx104: Unregister IIO device on remove callback
>
>The devm_iio_device_register function should not be used if custom
>operations must be performed in the remove callback. This patch replaces
>the dem_iio_device_register call with a iio_device_register call and
>respective iio_device_unregister call in the remove callback.
>
>Fixes: 765550e4d98d ("iio: stx104: Add GPIO support for the Apex Embedded Systems STX104")
>Signed-off-by: William Breathitt Gray <vilhelm.gray@xxxxxxxxx>
>Cc: <Stable@xxxxxxxxxxxxxxx>
>Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
>
>diff --git a/drivers/iio/dac/stx104.c b/drivers/iio/dac/stx104.c
>index 792a97164cb2..bebbd00304ce 100644
>--- a/drivers/iio/dac/stx104.c
>+++ b/drivers/iio/dac/stx104.c
>@@ -65,6 +65,16 @@ struct stx104_gpio {
> unsigned int out_state;
> };
>
>+/**
>+ * struct stx104_dev - STX104 device private data structure
>+ * @indio_dev: IIO device
>+ * @chip: instance of the gpio_chip
>+ */
>+struct stx104_dev {
>+ struct iio_dev *indio_dev;
>+ struct gpio_chip *chip;
>+};
>+
> static int stx104_read_raw(struct iio_dev *indio_dev,
> struct iio_chan_spec const *chan, int *val, int *val2, long mask)
> {
>@@ -107,6 +117,7 @@ static const struct iio_chan_spec stx104_channels[STX104_NUM_CHAN] = {
> static int stx104_gpio_get_direction(struct gpio_chip *chip,
> unsigned int offset)
> {
>+ /* GPIO 0-3 are input only, while the rest are output only */
> if (offset < 4)
> return 1;
>
>@@ -169,6 +180,7 @@ static int stx104_probe(struct device *dev, unsigned int id)
> struct iio_dev *indio_dev;
> struct stx104_iio *priv;
> struct stx104_gpio *stx104gpio;
>+ struct stx104_dev *stx104dev;
> int err;
>
> indio_dev = devm_iio_device_alloc(dev, sizeof(*priv));
>@@ -179,6 +191,10 @@ static int stx104_probe(struct device *dev, unsigned int id)
> if (!stx104gpio)
> return -ENOMEM;
>
>+ stx104dev = devm_kzalloc(dev, sizeof(*stx104dev), GFP_KERNEL);
>+ if (!stx104dev)
>+ return -ENOMEM;
>+
> if (!devm_request_region(dev, base[id], STX104_EXTENT,
> dev_name(dev))) {
> dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
>@@ -199,12 +215,6 @@ static int stx104_probe(struct device *dev, unsigned int id)
> outw(0, base[id] + 4);
> outw(0, base[id] + 6);
>
>- err = devm_iio_device_register(dev, indio_dev);
>- if (err) {
>- dev_err(dev, "IIO device registering failed (%d)\n", err);
>- return err;
>- }
>-
> stx104gpio->chip.label = dev_name(dev);
> stx104gpio->chip.parent = dev;
> stx104gpio->chip.owner = THIS_MODULE;
>@@ -220,7 +230,9 @@ static int stx104_probe(struct device *dev, unsigned int id)
>
> spin_lock_init(&stx104gpio->lock);
>
>- dev_set_drvdata(dev, stx104gpio);
>+ stx104dev->indio_dev = indio_dev;
>+ stx104dev->chip = &stx104gpio->chip;
>+ dev_set_drvdata(dev, stx104dev);
>
> err = gpiochip_add_data(&stx104gpio->chip, stx104gpio);
> if (err) {
>@@ -228,14 +240,22 @@ static int stx104_probe(struct device *dev, unsigned int id)
> return err;
> }
>
>+ err = iio_device_register(indio_dev);
>+ if (err) {
>+ dev_err(dev, "IIO device registering failed (%d)\n", err);
>+ gpiochip_remove(&stx104gpio->chip);
>+ return err;
>+ }
>+
> return 0;
> }
>
> static int stx104_remove(struct device *dev, unsigned int id)
> {
>- struct stx104_gpio *const stx104gpio = dev_get_drvdata(dev);
>+ struct stx104_dev *const stx104dev = dev_get_drvdata(dev);
>
>- gpiochip_remove(&stx104gpio->chip);
>+ iio_device_unregister(stx104dev->indio_dev);
>+ gpiochip_remove(stx104dev->chip);
>
> return 0;
> }
>
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