From: Ian Abbott <abbotti@mev.co.uk>
Date: Wed, 29 Oct 2014 17:35:11 +0000 (+0000)
Subject: staging: comedi: das16: deschedule timer routine on detach
X-Git-Tag: omap-for-v3.19/fixes-rc1~73^2~554
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ab784e5075698ed3b767d5e264a50aab39add209;p=pandora-kernel.git

staging: comedi: das16: deschedule timer routine on detach

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>
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