linux-kernel - [041/264] target: Prevent TRANSPORT_FREE_CMD_INTR processing in core_tmr_drain_cmd

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Message-Id: <20111109213146.245219838@clark.kroah.org>
Date:	Wed, 09 Nov 2011 13:31:28 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Roland Dreier <roland@...estorage.com>,
	Christoph Hellwig <hch@....de>,
	Nicholas Bellinger <nab@...ingtidesystems.com>
Subject: [041/264] target: Prevent TRANSPORT_FREE_CMD_INTR processing in core_tmr_drain_cmd_list

3.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Nicholas Bellinger <nab@...ux-iscsi.org>

commit b0e062aec578c756d1aea4b5809294488366a6e8 upstream.

This patch contains a bugfix for TMR LUN_RESET related to TRANSPORT_FREE_CMD_INTR
operation, where core_tmr_drain_cmd_list() will now skip processing for this
case to prevent an ABORT_TASK status from being returned for descriptors that
are already queued up to be released by processing thread context.

Cc: Roland Dreier <roland@...estorage.com>
Cc: Christoph Hellwig <hch@....de>
Signed-off-by: Nicholas Bellinger <nab@...ingtidesystems.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/target/target_core_tmr.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/drivers/target/target_core_tmr.c
+++ b/drivers/target/target_core_tmr.c
@@ -337,6 +337,16 @@ int core_tmr_lun_reset(
 		 */
 		if (prout_cmd == cmd)
 			continue;
+		/*
+		 * Skip direct processing of TRANSPORT_FREE_CMD_INTR for
+		 * HW target mode fabrics.
+		 */
+		spin_lock(&cmd->t_state_lock);
+		if (cmd->t_state == TRANSPORT_FREE_CMD_INTR) {
+			spin_unlock(&cmd->t_state_lock);
+			continue;
+		}
+		spin_unlock(&cmd->t_state_lock);
 
 		atomic_dec(&cmd->t_transport_queue_active);
 		atomic_dec(&qobj->queue_cnt);


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