hw-mgmt: scripts: Fix mlxsw_minimal driver init triggered by SDK udev…

… event

When mlxsw_minimal driver initialization is triggered by Nvidia SDK udev event
the value of ASIC index passed to hw-mgmt ASIC init code is 0. This special case
was not handled correctly. Additionally, the case of legacy systems was not handled
correctly by hw-mgmt routine mapping ASIC PCI bus ID to I2C bus ID.

Fixes: #3684822

Signed-off-by: Felix Radensky <fradensky@nvidia.com>

usr/usr/bin/hw-management.sh

@@ -2517,12 +2517,17 @@ map_asic_pci_to_i2c_bus()
  local bus
  local pci_bus
  local i2c_bus
+ local asic_num=1
 
  if [ -z "$1" ]; then
  return 255
  fi
  [ -f "$config_path/asic_num" ] && asic_num=$(< $config_path/asic_num)
- if [ "$asic_num" ] && [ "$asic_num" -gt 1 ]; then
+ if [ $asic_num -eq 1 ]; then
+ return 255
+ fi
+
+ if [ $asic_num -gt 1 ]; then
  pci_bus=`basename $1`
  pci_bus="${pci_bus:5}"
  for ((i=1; i<=asic_num; i+=1)); do
@@ -2679,7 +2684,7 @@ do_chip_up_down()
  asic_i2c_bus=$?
  if [ $asic_i2c_bus -eq 255 ]; then
  set_asic_i2c_bus
- if [ -n "$asic_index" ]; then
+ if [ -n "$asic_index" ] && [ $asic_index -gt 0 ]; then
  asic_i2c_bus=$(< $config_path/asic${asic_index}_i2c_bus_id)
  else
  asic_i2c_bus=$(< $config_path/asic_bus)