hw-mgmt:scripts: Fix voltmon5 address conflict with DPU.

hw-mgmt: scripts: Resolve voltmon5 address conflict with the DPU.

When the DPU is powered off, hw-mgmt may receive two udev events
referencing the same voltmon address 0u06a (voltmon2 and voltmon5) but
originating from different I2C buses.

This results in an unintended removal of voltmon5 on the management
board.

Fix: add I2C bus validation for the DPU module.

Bug: 4744091

Signed-off-by: Oleksandr Shamray <[email protected]>

Author: sholeksandr

usr/usr/bin/hw-management-chassis-events.sh

@@ -1487,13 +1487,16 @@ else
 					# DPU event, replace output folder.
 					input_bus_num=$(echo "$3""$4" | xargs dirname | xargs dirname | xargs basename | cut -d"-" -f1)
 					slot_num=$(find_dpu_slot_from_i2c_bus $input_bus_num)
-					if [ "$prefix" == "voltmon1" ] || [ "$prefix" == "voltmon2" ]; then
-					    if [ ! -z "$slot_num" ]; then
-						    environment_path="$hw_management_path"/dpu"$slot_num"/environment
-						    alarm_path="$hw_management_path"/dpu"$slot_num"/alarm
-						    thermal_path="$hw_management_path"/dpu"$slot_num"/thermal
-					    fi
-                    	fi
+					if [ ! -z "$slot_num" ]; then
+						if [ "$prefix" == "voltmon1" ] || [ "$prefix" == "voltmon2" ]; then
+							environment_path="$hw_management_path"/dpu"$slot_num"/environment
+							alarm_path="$hw_management_path"/dpu"$slot_num"/alarm
+							thermal_path="$hw_management_path"/dpu"$slot_num"/thermal
+						else
+							# Skip other voltmons events, since its not present in DPU.
+							exit 0
+						fi
+					fi
 					;;
 				*)
 					;;