Patch "iscsi-target: Fix mutex_trylock usage in iscsit_increment_maxcmdsn" has been added to the 3.10-stable tree

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This is a note to let you know that I've just added the patch titled

    iscsi-target: Fix mutex_trylock usage in iscsit_increment_maxcmdsn

to the 3.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     iscsi-target-fix-mutex_trylock-usage-in-iscsit_increment_maxcmdsn.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 5e8e6b4b3adebf01a9d97056cbbfd8c44330df99 Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Date: Tue, 12 Nov 2013 17:54:56 -0800
Subject: iscsi-target: Fix mutex_trylock usage in iscsit_increment_maxcmdsn

From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>

commit 5e8e6b4b3adebf01a9d97056cbbfd8c44330df99 upstream.

This patch fixes a >= v3.10 regression bug with mutex_trylock() usage
within iscsit_increment_maxcmdsn(), that was originally added to allow
for a special case where ->cmdsn_mutex was already held from the
iscsit_execute_cmd() exception path for ib_isert.

When !mutex_trylock() was occuring under contention during normal RX/TX
process context codepaths, the bug was manifesting itself as the following
protocol error:

  Received CmdSN: 0x000fcbb7 is greater than MaxCmdSN: 0x000fcbb6, protocol error.
  Received CmdSN: 0x000fcbb8 is greater than MaxCmdSN: 0x000fcbb6, protocol error.

This patch simply avoids the direct ib_isert callback in lio_queue_status()
for the special iscsi_execute_cmd() exception cases, that allows the problematic
mutex_trylock() usage in iscsit_increment_maxcmdsn() to go away.

Reported-by: Moussa Ba <moussaba@xxxxxxxxxx>
Tested-by: Moussa Ba <moussaba@xxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/target/iscsi/iscsi_target_configfs.c |    5 +++++
 drivers/target/iscsi/iscsi_target_device.c   |    6 +-----
 2 files changed, 6 insertions(+), 5 deletions(-)

--- a/drivers/target/iscsi/iscsi_target_configfs.c
+++ b/drivers/target/iscsi/iscsi_target_configfs.c
@@ -1650,6 +1650,11 @@ static int lio_queue_status(struct se_cm
 	struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);
 
 	cmd->i_state = ISTATE_SEND_STATUS;
+
+	if (cmd->se_cmd.scsi_status || cmd->sense_reason) {
+		iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
+		return 0;
+	}
 	cmd->conn->conn_transport->iscsit_queue_status(cmd->conn, cmd);
 
 	return 0;
--- a/drivers/target/iscsi/iscsi_target_device.c
+++ b/drivers/target/iscsi/iscsi_target_device.c
@@ -60,11 +60,7 @@ void iscsit_increment_maxcmdsn(struct is
 
 	cmd->maxcmdsn_inc = 1;
 
-	if (!mutex_trylock(&sess->cmdsn_mutex)) {
-		sess->max_cmd_sn += 1;
-		pr_debug("Updated MaxCmdSN to 0x%08x\n", sess->max_cmd_sn);
-		return;
-	}
+	mutex_lock(&sess->cmdsn_mutex);
 	sess->max_cmd_sn += 1;
 	pr_debug("Updated MaxCmdSN to 0x%08x\n", sess->max_cmd_sn);
 	mutex_unlock(&sess->cmdsn_mutex);


Patches currently in stable-queue which might be from nab@xxxxxxxxxxxxxxx are

queue-3.10/iscsi-target-fix-mutex_trylock-usage-in-iscsit_increment_maxcmdsn.patch
queue-3.10/iscsi-target-fix-extract_param-to-handle-buffer-length-corner-case.patch
queue-3.10/iscsi-target-chap-auth-shouldn-t-match-username-with-trailing-garbage.patch
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