Messages in this thread | | | Date | Thu, 7 Aug 2003 19:02:11 +0200 | From | Gerd Knorr <> | Subject | Re: [patch] v4l: sysfs'ify videodev |
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On Thu, Aug 07, 2003 at 04:55:19PM +0100, Russell King wrote: > On Thu, Aug 07, 2003 at 05:43:42PM +0200, Gerd Knorr wrote: > > +static void video_release(struct class_device *cd) > > +{ > > + struct video_device *vfd = container_of(cd, struct video_device, class_dev); > > > > -static struct proc_dir_entry *video_dev_proc_entry = NULL; > > -struct proc_dir_entry *video_proc_entry = NULL; > > -EXPORT_SYMBOL(video_proc_entry); > > -LIST_HEAD(videodev_proc_list); > > +#if 1 /* needed until all drivers are fixed */ > > + if (!vfd->release) > > + return; > > +#endif > > + vfd->release(vfd); > > +} > > Ok, so you're allowing the release to happen elsewhere. How are you > ensuring that the code which vfd->release points to hasn't been > unloaded before the video device has been released,
Which exact corner case you are refering to? video_release() being called _after_ video_unregister_device() returns due to a sysfs file being busy? Doesn't sysfs refcounting take care of that? If not module_{get|put}(vfd->fops->owner) at sensible places should fix that. get in video_unregister_device(), put in video_release()?
> or, even, how > are you preventing the module containing the above code being > removed before all video devices have been released?
videodev.ko simply can't be unloaded while v4l drivers are loaded due to symbol references.
Gerd
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