staging: comedi: comedi_fops: introduce comedi_is_subdevice_running()

Introduce a helper function that checks the subdevice runflags to
see if the subdevice is running a command.
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/comedi_fops.c

@@ -375,6 +375,14 @@ unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
 }
 EXPORT_SYMBOL(comedi_get_subdevice_runflags);
 
+bool comedi_is_subdevice_running(struct comedi_subdevice *s)
+{
+	unsigned runflags = comedi_get_subdevice_runflags(s);
+
+	return (runflags & SRF_RUNNING) ? true : false;
+}
+EXPORT_SYMBOL_GPL(comedi_is_subdevice_running);
+
 /*
    This function restores a subdevice to an idle state.
  */

drivers/staging/comedi/comedidev.h

@@ -362,6 +362,8 @@ enum subdevice_runflags {
 	SRF_RUNNING = 0x08000000
 };
 
+bool comedi_is_subdevice_running(struct comedi_subdevice *s);
+
 int comedi_check_chanlist(struct comedi_subdevice *s,
 			  int n,
 			  unsigned int *chanlist);