linux-kernel - [PATCH 4.9 067/120] ibmvscsis: Fix srp_transfer

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Message-Id: <20170118104650.841002009@linuxfoundation.org>
Date:   Wed, 18 Jan 2017 11:46:25 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Steven Royer <seroyer@...ux.vnet.ibm.com>,
        "Bryant G. Ly" <bgly@...ibm.com>,
        Bart Van Assche <bart.vanassche@...disk.com>
Subject: [PATCH 4.9 067/120] ibmvscsis: Fix srp_transfer_data fail return code

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

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

From: Bryant G. Ly <bgly@...ibm.com>

commit 7c9d8d0c41b3e24473ac7648a7fc2d644ccf08ff upstream.

If srp_transfer_data fails within ibmvscsis_write_pending, then
the most likely scenario is that the client timed out the op and
removed the TCE mapping. Thus it will loop forever retrying the
op that is pretty much guaranteed to fail forever. A better return
code would be EIO instead of EAGAIN.

Reported-by: Steven Royer <seroyer@...ux.vnet.ibm.com>
Tested-by: Steven Royer <seroyer@...ux.vnet.ibm.com>
Signed-off-by: Bryant G. Ly <bgly@...ibm.com>
Signed-off-by: Bart Van Assche <bart.vanassche@...disk.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
+++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
@@ -3702,7 +3702,7 @@ static int ibmvscsis_write_pending(struc
 			       1, 1);
 	if (rc) {
 		pr_err("srp_transfer_data() failed: %d\n", rc);
-		return -EAGAIN;
+		return -EIO;
 	}
 	/*
 	 * We now tell TCM to add this WRITE CDB directly into the TCM storage