linux-kernel - [PATCH 3.16 039/204] IB/ocrdma: fix incorrect fall-through on switch statement

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Message-ID: <lsq.1514480744.808394865@decadent.org.uk>
Date:   Thu, 28 Dec 2017 17:05:44 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Colin Ian King" <colin.king@...onical.com>,
        "Doug Ledford" <dledford@...hat.com>,
        "Leon Romanovsky" <leonro@...lanox.com>
Subject: [PATCH 3.16 039/204] IB/ocrdma: fix incorrect fall-through on
 switch statement

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

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

From: Colin Ian King <colin.king@...onical.com>

commit 06564f60859bdf7e73d70ae35d7e285e96ae9c46 upstream.

In the case where mbox_status is OCRDMA_MBX_STATUS_FAILED and
add_status is OCRDMA_MBX_STATUS_FAILED err_num is assigned -EAGAIN
however the case OCRDMA_MBX_STATUS_FAILED is missing a break and
falls through to the default case which then re-assigns err_num
to -EFAULT.   Fix this so that err_num is assigned to -EAGAIN
for the add_status OCRDMA_MBX_STATUS_FAILED case and -EFAULT
otherwise.

Detected by CoverityScan CID#703125 ("Missing break in switch")

Fixes: fe2caefcdf58 ("RDMA/ocrdma: Add driver for Emulex OneConnect IBoE RDMA adapter")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
Reviewed-by: Leon Romanovsky <leonro@...lanox.com>
Signed-off-by: Doug Ledford <dledford@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/infiniband/hw/ocrdma/ocrdma_hw.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
+++ b/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
@@ -235,7 +235,10 @@ static int ocrdma_get_mbx_errno(u32 stat
 		case OCRDMA_MBX_ADDI_STATUS_INSUFFICIENT_RESOURCES:
 			err_num = -EAGAIN;
 			break;
+		default:
+			err_num = -EFAULT;
 		}
+		break;
 	default:
 		err_num = -EFAULT;
 	}