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staging: comedi: Add lockdep_assert_held() calls for dev->attach_lock

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There are not a lot of functions in the core comedi module that require
the R/W semaphore `attach_lock` in `struct comedi_device` to be locked
(although there are a few functions that require at least one of
`attach_lock` and `mutex` to be locked).  One function that requires the
caller to lock `attach_lock` is `comedi_device_detach_cleanup()` so add
a call to `lockdep_assert_held()` to check and document that.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2019-04-17 15:39:30 +01:00 committed by Greg Kroah-Hartman
parent 77c21b626b
commit f44303e852
1 changed files with 1 additions and 0 deletions
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drivers/staging/comedi/drivers.c
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@ -159,6 +159,7 @@ static void comedi_device_detach_cleanup(struct comedi_device *dev)
int i;
struct comedi_subdevice *s;
lockdep_assert_held(&dev->attach_lock);
lockdep_assert_held(&dev->mutex);
if (dev->subdevices) {
for (i = 0; i < dev->n_subdevices; i++) {