selftests: firmware: skip timeout checks for kernels without user mode helper

The CONFIG_FW_LOADER_USER_HELPER is mostly disabled these days, so skip
timeout setting for these kernels.

Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 31 insertions, 6 deletions

diff --git a/tools/testing/selftests/firmware/fw_filesystem.sh b/tools/testing/selftests/firmware/fw_filesystem.sh
index 3fc6c10c2479..c4366dc74e01 100755
--- a/tools/testing/selftests/firmware/fw_filesystem.sh
+++ b/tools/testing/selftests/firmware/fw_filesystem.sh
@@ -9,7 +9,15 @@ modprobe test_firmware
 
 DIR=/sys/devices/virtual/misc/test_firmware
 
-OLD_TIMEOUT=$(cat /sys/class/firmware/timeout)
+# CONFIG_FW_LOADER_USER_HELPER has a sysfs class under /sys/class/firmware/
+# These days no one enables CONFIG_FW_LOADER_USER_HELPER so check for that
+# as an indicator for CONFIG_FW_LOADER_USER_HELPER.
+HAS_FW_LOADER_USER_HELPER=$(if [ -d /sys/class/firmware/ ]; then echo yes; else echo no; fi)
+
+if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
+        OLD_TIMEOUT=$(cat /sys/class/firmware/timeout)
+fi
+
 OLD_FWPATH=$(cat /sys/module/firmware_class/parameters/path)
 
 FWPATH=$(mktemp -d)
@@ -17,7 +25,9 @@ FW="$FWPATH/test-firmware.bin"
 
 test_finish()
 {
-        echo "$OLD_TIMEOUT" >/sys/class/firmware/timeout
+        if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
+                echo "$OLD_TIMEOUT" >/sys/class/firmware/timeout
+        fi
         echo -n "$OLD_PATH" >/sys/module/firmware_class/parameters/path
         rm -f "$FW"
         rmdir "$FWPATH"
@@ -25,8 +35,11 @@ test_finish()
 
 trap "test_finish" EXIT
 
-# Turn down the timeout so failures don't take so long.
-echo 1 >/sys/class/firmware/timeout
+if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
+        # Turn down the timeout so failures don't take so long.
+        echo 1 >/sys/class/firmware/timeout
+fi
+
 # Set the kernel search path.
 echo -n "$FWPATH" >/sys/module/firmware_class/parameters/path
 
@@ -41,7 +54,9 @@ if diff -q "$FW" /dev/test_firmware >/dev/null ; then
         echo "$0: firmware was not expected to match" >&2
         exit 1
 else
-        echo "$0: timeout works"
+        if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
+                echo "$0: timeout works"
+        fi
 fi
 
 # This should succeed via kernel load or will fail after 1 second after
diff --git a/tools/testing/selftests/firmware/fw_userhelper.sh b/tools/testing/selftests/firmware/fw_userhelper.sh
index 6efbade12139..b9983f8e09f6 100755
--- a/tools/testing/selftests/firmware/fw_userhelper.sh
+++ b/tools/testing/selftests/firmware/fw_userhelper.sh
@@ -9,7 +9,17 @@ modprobe test_firmware
 
 DIR=/sys/devices/virtual/misc/test_firmware
 
-OLD_TIMEOUT=$(cat /sys/class/firmware/timeout)
+# CONFIG_FW_LOADER_USER_HELPER has a sysfs class under /sys/class/firmware/
+# These days no one enables CONFIG_FW_LOADER_USER_HELPER so check for that
+# as an indicator for CONFIG_FW_LOADER_USER_HELPER.
+HAS_FW_LOADER_USER_HELPER=$(if [ -d /sys/class/firmware/ ]; then echo yes; else echo no; fi)
+
+if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
+       OLD_TIMEOUT=$(cat /sys/class/firmware/timeout)
+else
+        echo "usermode helper disabled so ignoring test"
+        exit 0
+fi
 
 FWPATH=$(mktemp -d)
 FW="$FWPATH/test-firmware.bin"