From f2b305cd6711b7b3ce30db93b50bc5d6312950c8 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Sun, 2 May 2010 08:01:04 -0300 Subject: [PATCH] V4L/DVB: hdpvr: fix disconnect sequence Disconnecting the HDPVR caused a kernel oops if lockdep was enabled. In addition, if an app still had video0 open and attempted to call ioctl when the device was already disconnected the system would crash. Move the freeing and cleanup code to the release function: that is the right place for it since you know when you get there that nobody is using the device. Also removed usb_set_intfdata: v4l2_device_register sets this already to v4l2_dev. Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/hdpvr/hdpvr-core.c | 33 ++++--------------------- drivers/media/video/hdpvr/hdpvr-video.c | 18 ++++++++++++++ drivers/media/video/hdpvr/hdpvr.h | 5 ++++ 3 files changed, 28 insertions(+), 28 deletions(-) diff --git a/drivers/media/video/hdpvr/hdpvr-core.c b/drivers/media/video/hdpvr/hdpvr-core.c index 2fc9865fd486..830d47b05e1d 100644 --- a/drivers/media/video/hdpvr/hdpvr-core.c +++ b/drivers/media/video/hdpvr/hdpvr-core.c @@ -373,9 +373,6 @@ static int hdpvr_probe(struct usb_interface *interface, } #endif /* CONFIG_I2C */ - /* save our data pointer in this interface device */ - usb_set_intfdata(interface, dev); - /* let the user know what node this device is now attached to */ v4l2_info(&dev->v4l2_dev, "device now attached to %s\n", video_device_node_name(dev->video_dev)); @@ -391,44 +388,24 @@ error: static void hdpvr_disconnect(struct usb_interface *interface) { - struct hdpvr_device *dev; - - dev = usb_get_intfdata(interface); - usb_set_intfdata(interface, NULL); + struct hdpvr_device *dev = to_hdpvr_dev(usb_get_intfdata(interface)); + v4l2_info(&dev->v4l2_dev, "device %s disconnected\n", + video_device_node_name(dev->video_dev)); /* prevent more I/O from starting and stop any ongoing */ mutex_lock(&dev->io_mutex); dev->status = STATUS_DISCONNECTED; - v4l2_device_disconnect(&dev->v4l2_dev); - video_unregister_device(dev->video_dev); wake_up_interruptible(&dev->wait_data); wake_up_interruptible(&dev->wait_buffer); mutex_unlock(&dev->io_mutex); + v4l2_device_disconnect(&dev->v4l2_dev); msleep(100); flush_workqueue(dev->workqueue); mutex_lock(&dev->io_mutex); hdpvr_cancel_queue(dev); - destroy_workqueue(dev->workqueue); mutex_unlock(&dev->io_mutex); - - /* deregister I2C adapter */ -#ifdef CONFIG_I2C - mutex_lock(&dev->i2c_mutex); - if (dev->i2c_adapter) - i2c_del_adapter(dev->i2c_adapter); - kfree(dev->i2c_adapter); - dev->i2c_adapter = NULL; - mutex_unlock(&dev->i2c_mutex); -#endif /* CONFIG_I2C */ - + video_unregister_device(dev->video_dev); atomic_dec(&dev_nr); - - v4l2_info(&dev->v4l2_dev, "device %s disconnected\n", - video_device_node_name(dev->video_dev)); - - v4l2_device_unregister(&dev->v4l2_dev); - kfree(dev->usbc_buf); - kfree(dev); } diff --git a/drivers/media/video/hdpvr/hdpvr-video.c b/drivers/media/video/hdpvr/hdpvr-video.c index 196f82de48f0..d2f0ee29737f 100644 --- a/drivers/media/video/hdpvr/hdpvr-video.c +++ b/drivers/media/video/hdpvr/hdpvr-video.c @@ -1214,6 +1214,24 @@ static void hdpvr_device_release(struct video_device *vdev) struct hdpvr_device *dev = video_get_drvdata(vdev); hdpvr_delete(dev); + mutex_lock(&dev->io_mutex); + destroy_workqueue(dev->workqueue); + mutex_unlock(&dev->io_mutex); + + v4l2_device_unregister(&dev->v4l2_dev); + + /* deregister I2C adapter */ +#ifdef CONFIG_I2C + mutex_lock(&dev->i2c_mutex); + if (dev->i2c_adapter) + i2c_del_adapter(dev->i2c_adapter); + kfree(dev->i2c_adapter); + dev->i2c_adapter = NULL; + mutex_unlock(&dev->i2c_mutex); +#endif /* CONFIG_I2C */ + + kfree(dev->usbc_buf); + kfree(dev); } static const struct video_device hdpvr_video_template = { diff --git a/drivers/media/video/hdpvr/hdpvr.h b/drivers/media/video/hdpvr/hdpvr.h index 49ae25d83d10..b0f046df3cd8 100644 --- a/drivers/media/video/hdpvr/hdpvr.h +++ b/drivers/media/video/hdpvr/hdpvr.h @@ -111,6 +111,11 @@ struct hdpvr_device { u8 *usbc_buf; }; +static inline struct hdpvr_device *to_hdpvr_dev(struct v4l2_device *v4l2_dev) +{ + return container_of(v4l2_dev, struct hdpvr_device, v4l2_dev); +} + /* buffer one bulk urb of data */ struct hdpvr_buffer { -- 2.30.2