[PATCH 1/1] tests/gem_seqno_wrap: verify debugfs write with readback

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

Make sure that debugfs entry works as expected by reading
back the sequence number that was written.

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
---
 tests/gem_seqno_wrap.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tests/gem_seqno_wrap.c b/tests/gem_seqno_wrap.c
index 43e3851..776dedc 100644
--- a/tests/gem_seqno_wrap.c
+++ b/tests/gem_seqno_wrap.c
@@ -438,6 +438,7 @@ static int write_seqno(uint32_t seqno)
 	int fh;
 	char buf[32];
 	int r;
+	uint32_t rb;
 
 	if (options.dontwrap)
 		return 0;
@@ -457,6 +458,15 @@ static int write_seqno(uint32_t seqno)
 	if (options.verbose)
 		printf("next_seqno set to: 0x%x\n", seqno);
 
+	r = __read_seqno(&rb);
+	if (r < 0)
+		return r;
+
+	if (rb != seqno) {
+		printf("seqno readback differs rb:0x%x vs w:0x%x\n", rb, seqno);
+		return -1;
+	}
+
 	return 0;
 }
 
-- 
1.7.9.5