From 198b21c642a4c0dbf44d805742ff52aa25756216 Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Wed, 16 Apr 2014 14:19:17 -0700 Subject: [PATCH] staging: comedi: gsc_hpdi: factor out chanlist checking from (*do_cmdtest) Step 5 of the (*do_cmdtest) validates that the cmd->chanlist is compatible with the hardware. For aesthetics, factor out the step 5 code for the async command support. Tidy up the factored out code. To minimize the noise, change the dev_err() to dev_dbg(). Signed-off-by: H Hartley Sweeten Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/gsc_hpdi.c | 34 +++++++++++++++-------- 1 file changed, 22 insertions(+), 12 deletions(-) diff --git a/drivers/staging/comedi/drivers/gsc_hpdi.c b/drivers/staging/comedi/drivers/gsc_hpdi.c index 08d7655e24e7..bae4e9709135 100644 --- a/drivers/staging/comedi/drivers/gsc_hpdi.c +++ b/drivers/staging/comedi/drivers/gsc_hpdi.c @@ -360,12 +360,30 @@ static int gsc_hpdi_cmd(struct comedi_device *dev, return 0; } +static int gsc_hpdi_check_chanlist(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_cmd *cmd) +{ + int i; + + for (i = 0; i < cmd->chanlist_len; i++) { + unsigned int chan = CR_CHAN(cmd->chanlist[i]); + + if (chan != i) { + dev_dbg(dev->class_dev, + "chanlist must be ch 0 to 31 in order\n"); + return -EINVAL; + } + } + + return 0; +} + static int gsc_hpdi_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_cmd *cmd) { int err = 0; - int i; if (s->io_bits) return -EINVAL; @@ -411,17 +429,9 @@ static int gsc_hpdi_cmd_test(struct comedi_device *dev, if (err) return 4; - /* step 5: complain about special chanlist considerations */ - - for (i = 0; i < cmd->chanlist_len; i++) { - if (CR_CHAN(cmd->chanlist[i]) != i) { - /* XXX could support 8 or 16 channels */ - dev_err(dev->class_dev, - "chanlist must be ch 0 to 31 in order"); - err |= -EINVAL; - break; - } - } + /* Step 5: check channel list if it exists */ + if (cmd->chanlist && cmd->chanlist_len > 0) + err |= gsc_hpdi_check_chanlist(dev, s, cmd); if (err) return 5; -- 2.20.1