Revert "selftests: firmware: remove use of non-standard diff -Z option"

This reverts commit f70b472e937bb659a7b7a14e64f07308e230888c.

This breaks testing on Debian, and this patch was NACKed anyway.
The proper way to address this is a quirk for busybox as that is
where the issue is present.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Fixes: f70b472e937b ("selftests: firmware: remove use of non-standard diff -Z option")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/tools/testing/selftests/firmware/fw_filesystem.sh b/tools/testing/selftests/firmware/fw_filesystem.sh
index 466cf2f..a4320c4 100755 (executable)
--- a/tools/testing/selftests/firmware/fw_filesystem.sh
+++ b/tools/testing/selftests/firmware/fw_filesystem.sh
@@ -155,8 +155,11 @@ read_firmwares()
 {
        for i in $(seq 0 3); do
                config_set_read_fw_idx $i
-               # Verify the contents match
-               if ! diff -q "$FW" $DIR/read_firmware 2>/dev/null ; then
+               # Verify the contents are what we expect.
+               # -Z required for now -- check for yourself, md5sum
+               # on $FW and DIR/read_firmware will yield the same. Even
+               # cmp agrees, so something is off.
+               if ! diff -q -Z "$FW" $DIR/read_firmware 2>/dev/null ; then
                        echo "request #$i: firmware was not loaded" >&2
                        exit 1
                fi
@@ -168,7 +171,7 @@ read_firmwares_expect_nofile()
        for i in $(seq 0 3); do
                config_set_read_fw_idx $i
                # Ensures contents differ
-               if diff -q "$FW" $DIR/read_firmware 2>/dev/null ; then
+               if diff -q -Z "$FW" $DIR/read_firmware 2>/dev/null ; then
                        echo "request $i: file was not expected to match" >&2
                        exit 1
                fi