[PATCH i-g-t 8/8] lib/igt_fb: assert fb->size blt_fb_init()

[Matthew Auld]

If fb->size is zero here, the mmap failure is pretty obscure from the
logs. Make it more obvious if we hit this.

Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Zbigniew Kempczyński <zbigniew.kempczynski at intel.com>
---
 lib/igt_fb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/igt_fb.c b/lib/igt_fb.c
index 71c220a08..65e0638c2 100644
--- a/lib/igt_fb.c
+++ b/lib/igt_fb.c
@@ -2780,6 +2780,8 @@ static struct blt_copy_object *blt_fb_init(const struct igt_fb *fb,
 
 	blt->plane_offset = fb->offsets[plane];
 
+	igt_assert(fb->size);
+
 	if (is_xe_device(fb->fd))
 		blt->ptr = xe_bo_mmap_ext(fb->fd, handle, fb->size,
 					  PROT_READ | PROT_WRITE);
-- 
2.43.0