`s626_enc_insn_config()` is the `insn_config()` handler for a counter
subdevice. The `data[0]` value is supposed to be one of the
`INSN_CONFIG_...` constants defined in "comedi.h" indicating the type of
configuration instruction, but this function seems to be using it as a
variable value to preload the counter with. Various values of `data[0]`
are going to cause `check_insn_config_length()` in the comedi core
("comedi_fops.c") to return an error, and this function won't be called
in those cases. Most other values will log a warning to the kernel log.
It's not entirely clear what constant should be checked for in
`data[0]`, so add a "FIXME" comment for now.
Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx>
---
drivers/staging/comedi/drivers/s626.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/staging/comedi/drivers/s626.c b/drivers/staging/comedi/drivers/s626.c
index 2b03b68..2421766 100644
--- a/drivers/staging/comedi/drivers/s626.c
+++ b/drivers/staging/comedi/drivers/s626.c
@@ -1847,6 +1847,9 @@ static int s626_dio_insn_config(struct comedi_device *dev,
/* Now this function initializes the value of the counter (data[0])
and set the subdevice. To complete with trigger and interrupt
configuration */
+/* FIXME: data[0] is supposed to be an INSN_CONFIG_xxx constant indicating
+ * what is being configured, but this function appears to be using data[0]
+ * as a variable. */
static int s626_enc_insn_config(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
--
1.7.12
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