The comedi core checks if the (cmd->chanlist_len > s->len_chanlist) when the
comedi_cmd is copied from user to kernel space by __comedi_get_user_cmd().
If so, the core returns -EINVAL and will not call the subdevice (*do_cmdtest)
and (*do_cmd).
Remove the unnecessary "max" checks in the comedi driver (*do_cmdtest) and
helper functions.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c | 3 ---
drivers/staging/comedi/drivers/adl_pci9118.c | 2 --
drivers/staging/comedi/drivers/pcl812.c | 1 -
drivers/staging/comedi/drivers/rtd520.c | 4 ----
4 files changed, 10 deletions(-)
diff --git a/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c
b/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c
index 70e8f42..66c24e4 100644
--- a/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c
+++ b/drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c
@@ -734,7 +734,6 @@ static int apci3120_ai_cmdtest(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_cmd *cmd)
{
- const struct addi_board *this_board = comedi_board(dev);
int err = 0;
/* Step 1 : check if triggers are trivially valid */
@@ -779,8 +778,6 @@ static int apci3120_ai_cmdtest(struct comedi_device *dev,
}
err |= cfc_check_trigger_arg_min(&cmd->chanlist_len, 1);
- err |= cfc_check_trigger_arg_max(&cmd->chanlist_len,
- this_board->i_AiChannelList);
if (cmd->stop_src == TRIG_COUNT)
err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
diff --git a/drivers/staging/comedi/drivers/adl_pci9118.c
b/drivers/staging/comedi/drivers/adl_pci9118.c
index b6abef6..53bbc59 100644
--- a/drivers/staging/comedi/drivers/adl_pci9118.c
+++ b/drivers/staging/comedi/drivers/adl_pci9118.c
@@ -1259,8 +1259,6 @@ static int pci9118_ai_cmdtest(struct comedi_device *dev,
err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
err |= cfc_check_trigger_arg_min(&cmd->chanlist_len, 1);
- err |= cfc_check_trigger_arg_max(&cmd->chanlist_len,
- this_board->n_aichanlist);
err |= cfc_check_trigger_arg_min(&cmd->scan_end_arg,
cmd->chanlist_len);
diff --git a/drivers/staging/comedi/drivers/pcl812.c
b/drivers/staging/comedi/drivers/pcl812.c
index 5cc01fe..0cf115e 100644
--- a/drivers/staging/comedi/drivers/pcl812.c
+++ b/drivers/staging/comedi/drivers/pcl812.c
@@ -761,7 +761,6 @@ static int pcl812_ai_cmdtest(struct comedi_device *dev,
err |= cfc_check_trigger_arg_is(&cmd->convert_arg, 0);
err |= cfc_check_trigger_arg_min(&cmd->chanlist_len, 1);
- err |= cfc_check_trigger_arg_max(&cmd->chanlist_len, MAX_CHANLIST_LEN);
err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
if (cmd->stop_src == TRIG_COUNT)
diff --git a/drivers/staging/comedi/drivers/rtd520.c
b/drivers/staging/comedi/drivers/rtd520.c
index cd3fdf9..1b1c166 100644
--- a/drivers/staging/comedi/drivers/rtd520.c
+++ b/drivers/staging/comedi/drivers/rtd520.c
@@ -891,10 +891,6 @@ static int rtd_ai_cmdtest(struct comedi_device *dev,
/* step 4: fix up any arguments */
- if (cmd->chanlist_len > RTD_MAX_CHANLIST) {
- cmd->chanlist_len = RTD_MAX_CHANLIST;
- err++;
- }
if (cmd->scan_begin_src == TRIG_TIMER) {
tmp = cmd->scan_begin_arg;
rtd_ns_to_timer(&cmd->scan_begin_arg,
--
1.8.5.2
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