staging: comedi: use attach_lock semaphore during attach and detach

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Acquire the `attach_lock` semaphore in the `struct comedi_device` while
modifying the `attached` flag.  This is a "write" acquire.  Note that
the main mutex in the `struct comedi_device` is also held at this time.
Tasks wishing to check the device is attached will need to either
acquire the main mutex, or "read" acquire the `attach_lock` semaphore,
or both in that order.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Ian Abbott 2013-11-08 15:03:25 +00:00 • committed by Greg Kroah-Hartman

parent 2f3fdcd7ce

commit bf11c13424

1 changed files with 4 additions and 1 deletions

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drivers/staging/comedi/drivers.c

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