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staging: comedi: das16: deschedule timer routine on detach

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The "das16" driver optionally uses a kernel timer and a DMA channel to
support asynchronous data acquisition, but currently never calls
`del_timer_sync()`.  There is some possibility the timer routine could
still be scheduled to run when the comedi "detach" handler is run to
clean up the device and cause a certain amount of havoc.  Avoid that by
calling `del_time_sync()` in the comedi "detach" handler
`das16_detach()` if the timer was initialized by the "attach" handler
`das16_attach()`.  Use the timer's `data` member to tell whether it was
initialized or not.

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 2014-10-29 17:35:11 +00:00 • committed by Greg Kroah-Hartman
commit ab784e5075
1 changed files with 2 additions and 0 deletions
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2
drivers/staging/comedi/drivers/das16.c
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@ -1228,6 +1228,8 @@ static void das16_detach(struct comedi_device *dev)
int i;
if (devpriv) {
if (devpriv->timer.data)
del_timer_sync(&devpriv->timer);
if (dev->iobase)
das16_reset(dev);