ublk: check cmd_op first

In preparation for skipping some of the other checks for certain IO
opcodes, move the cmd_op check earlier.

Signed-off-by: Caleb Sander Mateos <[email protected]>
Reviewed-by: Ming Lei <[email protected]>

Author: calebsander

drivers/block/ublk_drv.c

@@ -2177,12 +2177,17 @@ static int __ublk_ch_uring_cmd(struct io_uring_cmd *cmd,
 	struct ublk_io *io;
 	u32 cmd_op = cmd->cmd_op;
 	unsigned tag = ub_cmd->tag;
-	int ret = -EINVAL;
+	int ret;
 
 	pr_devel("%s: received: cmd op %d queue %d tag %d result %d\n",
 			__func__, cmd->cmd_op, ub_cmd->q_id, tag,
 			ub_cmd->result);
 
+	ret = ublk_check_cmd_op(cmd_op);
+	if (ret)
+		goto out;
+
+	ret = -EINVAL;
 	if (ub_cmd->q_id >= ub->dev_info.nr_hw_queues)
 		goto out;
 
@@ -2215,11 +2220,6 @@ static int __ublk_ch_uring_cmd(struct io_uring_cmd *cmd,
 			^ (_IOC_NR(cmd_op) == UBLK_IO_NEED_GET_DATA))
 		goto out;
 
-	ret = ublk_check_cmd_op(cmd_op);
-	if (ret)
-		goto out;
-
-	ret = -EINVAL;
 	switch (_IOC_NR(cmd_op)) {
 	case UBLK_IO_REGISTER_IO_BUF:
 		return ublk_register_io_buf(cmd, ubq, tag, ub_cmd->addr, issue_flags);