scsi-block: fix direction of BYTCHK test for VERIFY commands

The direction is wrong; scsi_block_is_passthrough returns
false for commands that *can* use sglists.

Reported-by: Zhang Qian <zhangqian@sangfor.com.cn>
Fixes: 8fdc7839e40f43a426bc7e858cf1dbfe315a3804
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 1f8af0d186abf9ef775a74d41bf2852ed8d59b63)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
index a96319138aca7dd0a54a1177f30786b4edebf29b..5796226704d4da583bcb109f9235e335365f97f8 100644 (file)
--- a/hw/scsi/scsi-disk.c
+++ b/hw/scsi/scsi-disk.c
@@ -2694,7 +2694,7 @@ static bool scsi_block_is_passthrough(SCSIDiskState *s, uint8_t *buf)
          * for the number of logical blocks specified in the length
          * field).  For other modes, do not use scatter/gather operation.
          */
-        if ((buf[1] & 6) != 2) {
+        if ((buf[1] & 6) == 2) {
             return false;
         }
         break;