linux-kernel - [PATCH 4.8 136/140] target/tcm_fc: use CPU affinity for responses

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Date:   Wed, 26 Oct 2016 14:23:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hannes Reinecke <hare@...e.com>,
        Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 4.8 136/140] target/tcm_fc: use CPU affinity for responses

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

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

From: Hannes Reinecke <hare@...e.de>

commit 1ba0158fa66b5b2c597a748f87be1650c9960ccc upstream.

The libfc stack assigns exchange IDs based on the CPU the request
was received on, so we need to send the responses via the same CPU.
Otherwise the send logic gets confuses and responses will be delayed,
causing exchange timeouts on the initiator side.

Signed-off-by: Hannes Reinecke <hare@...e.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/target/tcm_fc/tfc_cmd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/target/tcm_fc/tfc_cmd.c
+++ b/drivers/target/tcm_fc/tfc_cmd.c
@@ -572,7 +572,7 @@ static void ft_send_work(struct work_str
 	if (target_submit_cmd(&cmd->se_cmd, cmd->sess->se_sess, fcp->fc_cdb,
 			      &cmd->ft_sense_buffer[0], scsilun_to_int(&fcp->fc_lun),
 			      ntohl(fcp->fc_dl), task_attr, data_dir,
-			      TARGET_SCF_ACK_KREF))
+			      TARGET_SCF_ACK_KREF | TARGET_SCF_USE_CPUID))
 		goto err;
 
 	pr_debug("r_ctl %x alloc target_submit_cmd\n", fh->fh_r_ctl);