linux-kernel - [PATCH 4/9] lightnvm: check mm before use

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Message-Id: <1449397551-16525-5-git-send-email-m@bjorling.me>
Date:	Sun,  6 Dec 2015 11:25:46 +0100
From:	Matias Bjørling <m@...rling.me>
To:	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	axboe@...com
Cc:	Matias Bjørling <m@...rling.me>
Subject: [PATCH 4/9] lightnvm: check mm before use

The core can may issue I/Os before a media manager is registered with
the lightnvm subsystem. Make sure that we don't call the media manager
->end_io prematurely with a null pointer.

Signed-off-by: Matias Bjørling <m@...rling.me>
---
 drivers/nvme/host/lightnvm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
index 06c3364..762c9a7 100644
--- a/drivers/nvme/host/lightnvm.c
+++ b/drivers/nvme/host/lightnvm.c
@@ -455,7 +455,7 @@ static void nvme_nvm_end_io(struct request *rq, int error)
 	struct nvm_rq *rqd = rq->end_io_data;
 	struct nvm_dev *dev = rqd->dev;
 
-	if (dev->mt->end_io(rqd, error))
+	if (dev->mt && dev->mt->end_io(rqd, error))
 		pr_err("nvme: err status: %x result: %lx\n",
 				rq->errors, (unsigned long)rq->special);
 
-- 
2.1.4

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