selftests: txring_overwrite: fix incorrect test of mmap() return value

[thirdparty/kernel/stable.git] / tools / testing / selftests / net / txring_overwrite.c

diff --git a/tools/testing/selftests/net/txring_overwrite.c b/tools/testing/selftests/net/txring_overwrite.c
index fd8b1c663c391cafa42384034b1e0299e9dab2ec..7d9ea039450a377c7a7f964002dccd1ff7713767 100644 (file)
--- a/tools/testing/selftests/net/txring_overwrite.c
+++ b/tools/testing/selftests/net/txring_overwrite.c
@@ -113,7 +113,7 @@ static int setup_tx(char **ring)
 
        *ring = mmap(0, req.tp_block_size * req.tp_block_nr,
                     PROT_READ | PROT_WRITE, MAP_SHARED, fdt, 0);
-       if (!*ring)
+       if (*ring == MAP_FAILED)
                error(1, errno, "mmap");
 
        return fdt;