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Opened on 08/11/10 at 11:35:16
Closed on 03/13/12 at 11:37:31
#1670 closed defect (wontfix)
IO driver unregister is problematic
| Reported by: | Sebastian Huber | Owned by: | Joel Sherrill |
|---|---|---|---|
| Priority: | normal | Milestone: | 4.11 |
| Component: | score | Version: | 4.11 |
| Severity: | normal | Keywords: | |
| Cc: | Blocked By: | ||
| Blocking: |
Description
IO drivers will be registered with rtems_io_register_driver() and unregistered with rtems_io_unregister_driver(). User typically access the drivers via the file system. Some drivers have other users e.g. the block device cache (bdbuf). Now we have the problem that nobody knows if a driver is in use by someone. This is problematic if drivers come and go during the system lifetime for example in case of removable media (USB sticks). Currently it is possible that the driver changes during two read() or write() calls. We have to introduce some sort of reference counting. A simple approach is provided by the attached patch.
Attachments (1)
Change History (3)
Changed on 08/11/10 at 11:35:16 by Sebastian Huber
| Attachment: | iodriver.patch added |
|---|
comment:1 Changed on 03/13/12 at 11:37:31 by Sebastian Huber
| Resolution: | → wontfix |
|---|---|
| Status: | new → closed |
Removable drivers should use this:
http://git.rtems.org/rtems/commit/?id=c5392ef924c0d6f024012f294f39fdb5c6ac2da8
comment:2 Changed on 11/24/14 at 18:58:28 by Gedare Bloom
| Version: | HEAD → 4.11 |
|---|
Replace Version=HEAD with Version=4.11 for the tickets with Milestone >= 4.11
IO driver with reference counting.