testusb: expose looping forever option "l" to user

The testusb.c tool has support for looping forever implemented, which
may be useful for stress test, yet it is not exposed to the user, so
even though the code is there, it cannot be used.  This commit adds
"l" to the set of options handled by the application which enables
the feature.

Also, I collate help information for each command line option to make
it easier to use for novice.

Signed-off-by: Du Changbin <changbinx.du@intel.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 16 insertions, 5 deletions

diff --git a/tools/usb/testusb.c b/tools/usb/testusb.c
index 82d7c590c026..b0adb2710c02 100644
--- a/tools/usb/testusb.c
+++ b/tools/usb/testusb.c
@@ -425,7 +425,7 @@ int main (int argc, char **argv)
         /* for easy use when hotplugging */
         device = getenv ("DEVICE");
 
-        while ((c = getopt (argc, argv, "D:aA:c:g:hns:t:v:")) != EOF)
+        while ((c = getopt (argc, argv, "D:aA:c:g:hlns:t:v:")) != EOF)
         switch (c) {
         case 'D':       /* device, if only one */
                 device = optarg;
@@ -468,10 +468,21 @@ int main (int argc, char **argv)
         case 'h':
         default:
 usage:
-                fprintf (stderr, "usage: %s [-n] [-D dev | -a | -A usbfs-dir]\n"
-                        "\t[-c iterations]  [-t testnum]\n"
-                        "\t[-s packetsize] [-g sglen] [-v vary]\n",
-                        argv [0]);
+                fprintf (stderr,
+                        "usage: %s [options]\n"
+                        "Options:\n"
+                        "\t-D dev               only test specific device\n"
+                        "\t-A usbfs-dir\n"
+                        "\t-a           test all recognized devices\n"
+                        "\t-l           loop forever(for stress test)\n"
+                        "\t-t testnum   only run specified case\n"
+                        "\t-n           no test running, show devices to be tested\n"
+                        "Case arguments:\n"
+                        "\t-c iterations        default 1000\n"
+                        "\t-s packetsize        default 512\n"
+                        "\t-g sglen     default 32\n"
+                        "\t-v vary              default 512\n",
+                        argv[0]);
                 return 1;
         }
         if (optind != argc)