From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Thu, 6 Jun 2013 08:36:41 +0000 (-0700)
Subject: target: Drop unnecessary CMD_T_DEV_ACTIVE check from transport_lun_remove_cmd
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=0b66818ac6de67a6125ae203272fb76e79b3a20f;p=deliverable%2Flinux.git

target: Drop unnecessary CMD_T_DEV_ACTIVE check from transport_lun_remove_cmd

This patch drops an unnecessary acquire/release of se_cmd->t_state_lock within
transport_lun_remove_cmd() when checking CMD_T_DEV_ACTIVE for invoking
target_remove_from_state_list().

For all fast path completion cases, transport_lun_remove_cmd() is always
called ahead of transport_cmd_check_stop(), and since transport_cmd_check_stop()
is calling target_remove_from_state_list() when remove_from_lists=true,
the t_state_lock usage in transport_lun_remove_cmd() can safely be removed.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Roland Dreier <roland@kernel.org>
Cc: Kent Overstreet <koverstreet@google.com>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Cc: Moussa Ba <moussaba@micron.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 39319efe50c1..bc37666bc941 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -530,13 +530,6 @@ static void transport_lun_remove_cmd(struct se_cmd *cmd)
 	if (!lun)
 		return;
 
-	spin_lock_irqsave(&cmd->t_state_lock, flags);
-	if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
-		cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
-		target_remove_from_state_list(cmd);
-	}
-	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
-
 	spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 	if (!list_empty(&cmd->se_lun_node))
 		list_del_init(&cmd->se_lun_node);