selftests/eeh: Skip ahci adapters

The ahci driver doesn't support error recovery, and if your root
filesystem is attached to it the eeh-basic.sh test will likely kill
your machine.

So skip any device we see using the ahci driver.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200326061144.2006522-1-mpe@ellerman.id.au

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

@@ -41,6 +41,11 @@ for dev in `ls -1 /sys/bus/pci/devices/ | grep '\.0$'` ; do
 		continue;
 	fi
 
+	if [ "ahci" = "$(basename $(realpath /sys/bus/pci/devices/$dev/driver))" ] ; then
+		echo "$dev, Skipped: ahci doesn't support recovery"
+		continue
+	fi
+
 	# Don't inject errosr into an already-frozen PE. This happens with
 	# PEs that contain multiple PCI devices (e.g. multi-function cards)
 	# and injecting new errors during the recovery process will probably