diff options
| author | Hans Verkuil <hverkuil@xs4all.nl> | 2008-07-17 22:48:38 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2008-07-20 12:28:44 +0200 |
| commit | c3fb62bf927cee771c3bcd5053e393e7df518f28 (patch) | |
| tree | 57819aaabfccac45fc135579aa5f266f01ca5cba /drivers | |
| parent | V4L/DVB (8389): videodev: simplify get_index() (diff) | |
| download | linux-c3fb62bf927cee771c3bcd5053e393e7df518f28.tar.xz linux-c3fb62bf927cee771c3bcd5053e393e7df518f28.zip | |
V4L/DVB (8390): videodev: add comment and remove magic number.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/video/videodev.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/media/video/videodev.c b/drivers/media/video/videodev.c index bf12b5f850e2..aca36dec6746 100644 --- a/drivers/media/video/videodev.c +++ b/drivers/media/video/videodev.c @@ -2023,9 +2023,13 @@ EXPORT_SYMBOL(video_ioctl2); static int get_index(struct video_device *vdev, int num) { u32 used = 0; + const unsigned max_index = sizeof(used) * 8 - 1; int i; - if (num >= 32) { + /* Currently a single v4l driver instance cannot create more than + 32 devices. + Increase to u64 or an array of u32 if more are needed. */ + if (num > max_index) { printk(KERN_ERR "videodev: %s num is too large\n", __func__); return -EINVAL; } @@ -2045,7 +2049,7 @@ static int get_index(struct video_device *vdev, int num) } i = ffz(used); - return i >= 32 ? -ENFILE : i; + return i > max_index ? -ENFILE : i; } static const struct file_operations video_fops; |