linux-kernel - [RESENT PATCH V2] nvme/core:disable streams when get stream params failed

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Date:   Wed, 13 May 2020 16:18:13 +0800
From:   Wu Bo <wubo40@...wei.com>
To:     <kbusch@...nel.org>, <axboe@...com>, <hch@....de>,
        <sagi@...mberg.me>
CC:     <linux-nvme@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <liuzhiqiang26@...wei.com>, <linfeilong@...wei.com>,
        <wubo40@...wei.com>
Subject: [RESENT PATCH V2] nvme/core:disable streams when get stream params failed

After enable nvme streams, then if get stream params failed, 
We should disable streams before return error in 
nvme_configure_directives() function.

Signed-off-by: Wu Bo <wubo40@...wei.com>
---
 drivers/nvme/host/core.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index f3c037f..29bef53 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -553,19 +553,22 @@ static int nvme_configure_directives(struct nvme_ctrl *ctrl)
 
 	ret = nvme_get_stream_params(ctrl, &s, NVME_NSID_ALL);
 	if (ret)
-		return ret;
+		goto out_disable_stream;
 
 	ctrl->nssa = le16_to_cpu(s.nssa);
 	if (ctrl->nssa < BLK_MAX_WRITE_HINTS - 1) {
 		dev_info(ctrl->device, "too few streams (%u) available\n",
 					ctrl->nssa);
-		nvme_disable_streams(ctrl);
-		return 0;
+		goto out_disable_stream;
 	}
 
 	ctrl->nr_streams = min_t(unsigned, ctrl->nssa, BLK_MAX_WRITE_HINTS - 1);
 	dev_info(ctrl->device, "Using %u streams\n", ctrl->nr_streams);
 	return 0;
+
+out_disable_stream:
+	nvme_disable_streams(ctrl);
+	return ret;
 }
 
 /*
-- 
1.8.3.1