Various bits of the DRM deal with minor->master:
In the case of the open helper its protected by the struct mutex.
In the release path it's protected on some paths, but not this one ...
/* if the master has gone away we can't do anything with the lock */
if (file_priv->minor->master)
drm_master_release(dev, filp);
and I can't see what makes this safe if the drm_release for the master
and a client occur at the same time ?
The setmaster/dropmaster ioctl seems similar - the various conditional
checks are not protected from parallel changes occuring during their
execution.
Is this a bug or is something clever afoot ?
Alan
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