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staging:iio:core set the iio_dev.info pointer to null on unregister under lock.
This prevents use of provider callbacks after it has been unregistered. Note that all code using this that can be called from a consumer *must* check the pointer before using and hold the info_exist_lock throughout the usage of the callbacks in info. Signed-off-by: Jonathan Cameron <jic23@kernel.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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2 changed files with 6 additions and 0 deletions
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@ -310,6 +310,7 @@ struct iio_buffer_setup_ops {
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* @chan_attr_group: [INTERN] group for all attrs in base directory
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* @name: [DRIVER] name of the device.
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* @info: [DRIVER] callbacks and constant info from driver
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* @info_exist_lock: [INTERN] lock to prevent use during removal
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* @chrdev: [INTERN] associated character device
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* @groups: [INTERN] attribute groups
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* @groupcounter: [INTERN] index of next attribute group
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@ -340,6 +341,7 @@ struct iio_dev {
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struct attribute_group chan_attr_group;
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const char *name;
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const struct iio_info *info;
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struct mutex info_exist_lock;
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const struct iio_buffer_setup_ops *setup_ops;
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struct cdev chrdev;
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#define IIO_MAX_GROUPS 6
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@ -594,6 +594,7 @@ struct iio_dev *iio_allocate_device(int sizeof_priv)
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device_initialize(&dev->dev);
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dev_set_drvdata(&dev->dev, (void *)dev);
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mutex_init(&dev->mlock);
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mutex_init(&dev->info_exist_lock);
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dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
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if (dev->id < 0) {
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@ -718,6 +719,9 @@ EXPORT_SYMBOL(iio_device_register);
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void iio_device_unregister(struct iio_dev *indio_dev)
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{
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mutex_lock(&indio_dev->info_exist_lock);
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indio_dev->info = NULL;
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mutex_unlock(&indio_dev->info_exist_lock);
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device_unregister(&indio_dev->dev);
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}
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EXPORT_SYMBOL(iio_device_unregister);
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