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Staging: comedi: amplc_dio200: Protect counter subdevice with spinlock
authorIan Abbott <abbotti@mev.co.uk>
Wed, 19 May 2010 15:59:40 +0000 (16:59 +0100)
committerGreg Kroah-Hartman <gregkh@suse.de>
Fri, 4 Jun 2010 20:38:53 +0000 (13:38 -0700)
commitee4063fa6bd801fa6ea045f23a2934db009b3dac
treef23288b2f1900fa34950381a2c63ab11f42e4391tree | snapshot
parentd4da77a73cb9cc9a1a349daa1a2723505b086e2dcommit | diff
Staging: comedi: amplc_dio200: Protect counter subdevice with spinlock

The internal state of an 82C54 counter timer chip will get messed up if
several threads read, write, configure, or check the status of the chip
simultaneously.  Protect the register access sequences with a spin lock.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/staging/comedi/drivers/amplc_dio200.c diff | blob | history
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