linux-kernel - RE: [PATCH] NVMe: fix error return code in nvme_submit_bio

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Date:	Mon, 13 May 2013 13:51:37 +0000
From:	"Wilcox, Matthew R" <matthew.r.wilcox@...el.com>
To:	Wei Yongjun <weiyj.lk@...il.com>,
	"Busch, Keith" <keith.busch@...el.com>,
	"Verma, Vishal L" <vishal.l.verma@...el.com>
CC:	"yongjun_wei@...ndmicro.com.cn" <yongjun_wei@...ndmicro.com.cn>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] NVMe: fix error return code in nvme_submit_bio_queue()

I can't apply this patch.  Instead of following what it says in MAINTAINERS, you've sent it to my Exchange address.  And now it's all mangled.

NVM EXPRESS DRIVER
M:      Matthew Wilcox <willy@...ux.intel.com>
L:      linux-nvme@...ts.infradead.org

________________________________________
From: Wei Yongjun [weiyj.lk@...il.com]
Sent: May 12, 2013 7:30 PM
To: Wilcox, Matthew R; Busch, Keith; Verma, Vishal L
Cc: yongjun_wei@...ndmicro.com.cn; linux-kernel@...r.kernel.org
Subject: [PATCH] NVMe: fix error return code in nvme_submit_bio_queue()

From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>

Fix to return -ENOMEM in the nvem iod alloc error handling case instead
of 0(possible overwrite to 0 by above nvme_submit_flush_data()), as done
elsewhere in this function.

Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
---
 drivers/block/nvme-core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index 8efdfaa..750c337 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -629,7 +629,7 @@ static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns,
        struct nvme_command *cmnd;
        struct nvme_iod *iod;
        enum dma_data_direction dma_dir;
-       int cmdid, length, result = -ENOMEM;
+       int cmdid, length, result;
        u16 control;
        u32 dsmgmt;
        int psegs = bio_phys_segments(ns->queue, bio);
@@ -641,8 +641,10 @@ static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns,
        }

        iod = nvme_alloc_iod(psegs, bio->bi_size, GFP_ATOMIC);
-       if (!iod)
+       if (!iod) {
+               result = -ENOMEM;
                goto nomem;
+       }
        iod->private = bio;

        result = -EBUSY;

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