[PATCH] scsi: scsi_debug: negate wrapped memcmp() result

From: Xu Rao <[email protected]>

comp_write_worker() returns true when the compared data matches.
memcmp() returns zero for equal data and non-zero for different data, so
its result must be negated before it is stored in a bool.

The first segment already uses !memcmp(), but the wrapped segment uses
memcmp() directly, reversing the match result. Use !memcmp() there as
well.

Fixes: 38d5c8336e60 ("scsi_debug: add Report supported opcodes+tmfs; Compare and write")
Cc: [email protected]
Signed-off-by: Xu Rao <[email protected]>
---
 drivers/scsi/scsi_debug.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 9d1c9c41d0f9..a5911482fc44 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -4310,8 +4310,8 @@ static bool comp_write_worker(struct sdeb_store_info *sip, u64 lba, u32 num,
 	if (!res)
 		return res;
 	if (rest)
-		res = memcmp(fsp, arr + ((num - rest) * lb_size),
-			     rest * lb_size);
+		res = !memcmp(fsp, arr + ((num - rest) * lb_size),
+			      rest * lb_size);
 	if (!res)
 		return res;
 	if (compare_only)
--
2.50.1