selftests/powerpc: Use stderr for debug messages in eeh-functions

We want to use stdout to return lists of devices, etc so log debug / status
messages to stderr rather than stdout.

Signed-off-by: Oliver O'Halloran <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

tools/testing/selftests/powerpc/eeh/eeh-functions.sh

···
 
 export KSELFTESTS_SKIP=4
 
+log() {
+	echo >/dev/stderr $*
+}
+
 pe_ok() {
 	local dev="$1"
 	local path="/sys/bus/pci/devices/$dev/eeh_pe_state"
···
 
 	if [ ! -e "/sys/kernel/debug/powerpc/eeh_dev_check" ] && \
 	   [ ! -e "/sys/kernel/debug/powerpc/eeh_dev_break" ] ; then
-		echo "debugfs EEH testing files are missing. Is debugfs mounted?"
+		log "debugfs EEH testing files are missing. Is debugfs mounted?"
 		exit $KSELFTESTS_SKIP;
 	fi
 
···
 eeh_can_break() {
 	# skip bridges since we can't recover them (yet...)
 	if [ -e "/sys/bus/pci/devices/$dev/pci_bus" ] ; then
-		echo "$dev, Skipped: bridge"
+		log "$dev, Skipped: bridge"
 		return 1;
 	fi
 
···
 	# it the system will generally go down. We should probably fix that
 	# at some point
 	if [ "ahci" = "$(basename $(realpath /sys/bus/pci/devices/$dev/driver))" ] ; then
-		echo "$dev, Skipped: ahci doesn't support recovery"
+		log "$dev, Skipped: ahci doesn't support recovery"
 		return 1;
 	fi
 
···
 	# result in the recovery failing and the device being marked as
 	# failed.
 	if ! pe_ok $dev ; then
-		echo "$dev, Skipped: Bad initial PE state"
+		log "$dev, Skipped: Bad initial PE state"
 		return 1;
 	fi
 
···
 	# testing so check that the argument is a well-formed sysfs device
 	# name.
 	if ! test -e /sys/bus/pci/devices/$dev/ ; then
-		echo "Error: '$dev' must be a sysfs device name (DDDD:BB:DD.F)"
+		log "Error: '$dev' must be a sysfs device name (DDDD:BB:DD.F)"
 		return 1;
 	fi
 
···
 		if pe_ok $dev ; then
 			break;
 		fi
-		echo "$dev, waited $i/${max_wait}"
+		log "$dev, waited $i/${max_wait}"
 		sleep 1
 	done
 
 	if ! pe_ok $dev ; then
-		echo "$dev, Failed to recover!"
+		log "$dev, Failed to recover!"
 		return 1;
 	fi
 
-	echo "$dev, Recovered after $i seconds"
+	log "$dev, Recovered after $i seconds"
 	return 0;
 }