Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma

[cascardo/linux.git] / drivers / staging / comedi / drivers / ni_mio_common.c

diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c
index 3cf3c05..0f97d7b 100644 (file)
--- a/drivers/staging/comedi/drivers/ni_mio_common.c
+++ b/drivers/staging/comedi/drivers/ni_mio_common.c
@@ -2772,7 +2772,15 @@ static int ni_ao_inttrig(struct comedi_device *dev,
        int i;
        static const int timeout = 1000;
 
-       if (trig_num != cmd->start_arg)
+       /*
+        * Require trig_num == cmd->start_arg when cmd->start_src == TRIG_INT.
+        * For backwards compatibility, also allow trig_num == 0 when
+        * cmd->start_src != TRIG_INT (i.e. when cmd->start_src == TRIG_EXT);
+        * in that case, the internal trigger is being used as a pre-trigger
+        * before the external trigger.
+        */
+       if (!(trig_num == cmd->start_arg ||
+             (trig_num == 0 && cmd->start_src != TRIG_INT)))
                return -EINVAL;
 
        /*