igt/gem_pwrite: Check that mmap(wc) succeeds

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 2 insertions, 0 deletions

diff --git a/tests/gem_pwrite.c b/tests/gem_pwrite.c
index 4c223581..5b6a77fb 100644
--- a/tests/gem_pwrite.c
+++ b/tests/gem_pwrite.c
@@ -121,6 +121,8 @@ static void test_big_gtt(int fd, int scale)
 	gem_set_domain(fd, handle, I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
 
 	ptr = gem_mmap__wc(fd, handle, 0, size, PROT_READ);
+	igt_assert(ptr);
+
 	for (offset = 0; offset < size; offset += 4096) {
 		int suboffset = (offset >> 12) % (4096 / sizeof(offset) - 1) * sizeof(offset);