HID: hiddev cleanup -- handle all error conditions properly

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This is a cleanup of hiddev and fixes the following issues:

- thread safety by locking in read & ioctl, introducing a per device mutex
- race between ioctl and disconnect, introducing a flag and locking
  in form of a per low level device mutex
- race between open and other methods, making sure only successfully
  opened devices are put on the list, changing order of events
- range checking both upper and lower limits of the minor range
- make sure further calls to open fail for unplugged devices even if
  the device still has opened files
- error checking for low level open
- possible loss of wakeup events, using standard waiting macros
- race in initialisation by moving registration after full initialisation

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

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This commit is contained in:

Oliver Neukum 2008-12-16 10:55:15 +01:00 • committed by Jiri Kosina

parent 42859e0bd2

commit 079034073f

1 changed files with 99 additions and 36 deletions

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drivers/hid/usbhid/hiddev.c

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