linux-kernel - [PATCH 3.16 219/305] iser: set sector for ambiguous mr status errors

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Message-ID: <lsq.1549201508.165642103@decadent.org.uk>
Date:   Sun, 03 Feb 2019 14:45:08 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Jason Gunthorpe" <jgg@...lanox.com>,
        "Sagi Grimberg" <sagi@...mberg.me>,
        "Dan Carpenter" <dan.carpenter@...cle.com>
Subject: [PATCH 3.16 219/305] iser: set sector for ambiguous mr status errors

3.16.63-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Sagi Grimberg <sagi@...mberg.me>

commit 24c3456c8d5ee6fc1933ca40f7b4406130682668 upstream.

If for some reason we failed to query the mr status, we need to make sure
to provide sufficient information for an ambiguous error (guard error on
sector 0).

Fixes: 0a7a08ad6f5f ("IB/iser: Implement check_protection")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Sagi Grimberg <sagi@...mberg.me>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/infiniband/ulp/iser/iser_verbs.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/drivers/infiniband/ulp/iser/iser_verbs.c
+++ b/drivers/infiniband/ulp/iser/iser_verbs.c
@@ -1165,7 +1165,9 @@ u8 iser_check_task_pi_status(struct iscs
 					 IB_MR_CHECK_SIG_STATUS, &mr_status);
 		if (ret) {
 			pr_err("ib_check_mr_status failed, ret %d\n", ret);
-			goto err;
+			/* Not a lot we can do, return ambiguous guard error */
+			*sector = 0;
+			return 0x1;
 		}
 
 		if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
@@ -1193,7 +1195,4 @@ u8 iser_check_task_pi_status(struct iscs
 	}
 
 	return 0;
-err:
-	/* Not alot we can do here, return ambiguous guard error */
-	return 0x1;
 }