target_core_sbc: use noop for SYNCHRONIZE_CACHE

Windows does not expect SYNCHRONIZE_CACHE to be not supported,
and will generate a BSOD upon shutdown when using rd_mcp backend.
So better use a noop here.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 290230d..60d4b51 100644 (file)
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -464,8 +464,11 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
                break;
        case SYNCHRONIZE_CACHE:
        case SYNCHRONIZE_CACHE_16:
-               if (!ops->execute_sync_cache)
-                       return TCM_UNSUPPORTED_SCSI_OPCODE;
+               if (!ops->execute_sync_cache) {
+                       size = 0;
+                       cmd->execute_cmd = sbc_emulate_noop;
+                       break;
+               }
 
                /*
                 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE