Documentation/accounting/getdelays.c: fix endless loop

When no option is passed to getdelays it just hangs, waiting
for a reply which will never come.

This patch prints usage() when no output marker is specified.

Signed-off-by: Marcus Meissner <meissner@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/accounting/getdelays.c b/Documentation/accounting/getdelays.c
index cc49400..7ea2311 100644 (file)
--- a/Documentation/accounting/getdelays.c
+++ b/Documentation/accounting/getdelays.c
@@ -392,6 +392,10 @@ int main(int argc, char *argv[])
                        goto err;
                }
        }
+       if (!maskset && !tid && !containerset) {
+               usage();
+               goto err;
+       }
 
        do {
                int i;