linux-kernel - [PATCH AUTOSEL 5.2 12/44] nvmet-file: fix nvmet_file

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Date:   Tue, 20 Aug 2019 09:39:56 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Logan Gunthorpe <logang@...tatee.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Chaitanya Kulkarni <chaitanya.kulkarni@....com>,
        Sasha Levin <sashal@...nel.org>, linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.2 12/44] nvmet-file: fix nvmet_file_flush() always returning an error

From: Logan Gunthorpe <logang@...tatee.com>

[ Upstream commit cfc1a1af56200362d1508b82b9a3cc3acb2eae0c ]

Presently, nvmet_file_flush() always returns a call to
errno_to_nvme_status() but that helper doesn't take into account the
case when errno=0. So nvmet_file_flush() always returns an error code.

All other callers of errno_to_nvme_status() check for success before
calling it.

To fix this, ensure errno_to_nvme_status() returns success if the
errno is zero. This should prevent future mistakes like this from
happening.

Fixes: c6aa3542e010 ("nvmet: add error log support for file backend")
Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Reviewed-by: Sagi Grimberg <sagi@...mberg.me>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@....com>
Signed-off-by: Sagi Grimberg <sagi@...mberg.me>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/target/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index e4db9a4411681..396cbc7ea3532 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -43,6 +43,9 @@ inline u16 errno_to_nvme_status(struct nvmet_req *req, int errno)
 	u16 status;
 
 	switch (errno) {
+	case 0:
+		status = NVME_SC_SUCCESS;
+		break;
 	case -ENOSPC:
 		req->error_loc = offsetof(struct nvme_rw_command, length);
 		status = NVME_SC_CAP_EXCEEDED | NVME_SC_DNR;
-- 
2.20.1