diff options
author | Hans Verkuil <hverkuil@xs4all.nl> | 2009-06-19 11:32:56 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-09-19 00:19:26 -0300 |
commit | 7ae0cd9bc793e16d8d68df3c17c601732cc1d3c7 (patch) | |
tree | 6e95700b260955b91793bbc58a7d20c486e5d358 /drivers/media | |
parent | 53dacb15705901e14b03dcba27e40364fedd9d09 (diff) | |
download | linux-7ae0cd9bc793e16d8d68df3c17c601732cc1d3c7.tar.bz2 |
V4L/DVB (12541): v4l: remove video_register_device_index
video_register_device_index is never actually called, instead the
stream index number is always calculated automatically.
This patch removes this function and simplifies the internal get_index
function since that can now always just return the first free index.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media')
-rw-r--r-- | drivers/media/video/v4l2-dev.c | 55 |
1 files changed, 15 insertions, 40 deletions
diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c index a7f1b69a7dab..1219721894a1 100644 --- a/drivers/media/video/v4l2-dev.c +++ b/drivers/media/video/v4l2-dev.c @@ -299,32 +299,28 @@ static const struct file_operations v4l2_fops = { }; /** - * get_index - assign stream number based on parent device + * get_index - assign stream index number based on parent device * @vdev: video_device to assign index number to, vdev->parent should be assigned - * @num: -1 if auto assign, requested number otherwise * * Note that when this is called the new device has not yet been registered - * in the video_device array. + * in the video_device array, but it was able to obtain a minor number. * - * Returns -ENFILE if num is already in use, a free index number if - * successful. + * This means that we can always obtain a free stream index number since + * the worst case scenario is that there are VIDEO_NUM_DEVICES - 1 slots in + * use of the video_device array. + * + * Returns a free index number. */ -static int get_index(struct video_device *vdev, int num) +static int get_index(struct video_device *vdev) { /* This can be static since this function is called with the global videodev_lock held. */ static DECLARE_BITMAP(used, VIDEO_NUM_DEVICES); int i; - if (num >= VIDEO_NUM_DEVICES) { - printk(KERN_ERR "videodev: %s num is too large\n", __func__); - return -EINVAL; - } - - /* Some drivers do not set the parent. In that case always return - num or 0. */ + /* Some drivers do not set the parent. In that case always return 0. */ if (vdev->parent == NULL) - return num >= 0 ? num : 0; + return 0; bitmap_zero(used, VIDEO_NUM_DEVICES); @@ -335,30 +331,15 @@ static int get_index(struct video_device *vdev, int num) } } - if (num >= 0) { - if (test_bit(num, used)) - return -ENFILE; - return num; - } - - i = find_first_zero_bit(used, VIDEO_NUM_DEVICES); - return i == VIDEO_NUM_DEVICES ? -ENFILE : i; + return find_first_zero_bit(used, VIDEO_NUM_DEVICES); } -int video_register_device(struct video_device *vdev, int type, int nr) -{ - return video_register_device_index(vdev, type, nr, -1); -} -EXPORT_SYMBOL(video_register_device); - /** - * video_register_device_index - register video4linux devices + * video_register_device - register video4linux devices * @vdev: video device structure we want to register * @type: type of device to register * @nr: which device number (0 == /dev/video0, 1 == /dev/video1, ... * -1 == first free) - * @index: stream number based on parent device; - * -1 if auto assign, requested number otherwise * * The registration code assigns minor numbers based on the type * requested. -ENFILE is returned in all the device slots for this @@ -377,8 +358,7 @@ EXPORT_SYMBOL(video_register_device); * * %VFL_TYPE_RADIO - A radio card */ -int video_register_device_index(struct video_device *vdev, int type, int nr, - int index) +int video_register_device(struct video_device *vdev, int type, int nr) { int i = 0; int ret; @@ -481,14 +461,9 @@ int video_register_device_index(struct video_device *vdev, int type, int nr, set_bit(nr, video_nums[type]); /* Should not happen since we thought this minor was free */ WARN_ON(video_device[vdev->minor] != NULL); - ret = vdev->index = get_index(vdev, index); + vdev->index = get_index(vdev); mutex_unlock(&videodev_lock); - if (ret < 0) { - printk(KERN_ERR "%s: get_index failed\n", __func__); - goto cleanup; - } - /* Part 3: Initialize the character device */ vdev->cdev = cdev_alloc(); if (vdev->cdev == NULL) { @@ -543,7 +518,7 @@ cleanup: vdev->minor = -1; return ret; } -EXPORT_SYMBOL(video_register_device_index); +EXPORT_SYMBOL(video_register_device); /** * video_unregister_device - unregister a video4linux device |