de10ffa527
destroy_dev() from d_close() cdev method would self-deadlock. devfs_close() bump device thread reference counter, and destroy_dev() sleeps, waiting for si_threadcount to reach zero for cdev without d_purge method. destroy_dev_sched() could be used instead from d_close(), to schedule execution of destroy_dev() in another context. The destroy_dev_sched_drain() function can be used to drain the scheduled calls to destroy_dev_sched(). Similarly, drain_dev_clone_events() drains the events clone to make sure no lingering devices are left after dev_clone event handler deregistered. make_dev_credf(MAKEDEV_REF) function should be used from dev_clone event handlers instead of make_dev()/make_dev_cred() to ensure that created device has reference counter bumped before cdev mutex is dropped inside make_dev(). Reviewed by: tegge (early versions), njl (programming interface) Debugging help and testing by: Peter Holm Approved by: re (kensmith) |
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| .. | ||
| cd9660 | ||
| coda | ||
| deadfs | ||
| devfs | ||
| fdescfs | ||
| fifofs | ||
| hpfs | ||
| msdosfs | ||
| ntfs | ||
| nullfs | ||
| nwfs | ||
| portalfs | ||
| procfs | ||
| pseudofs | ||
| smbfs | ||
| tmpfs | ||
| udf | ||
| unionfs | ||