linux-kernel - [PATCH 4/7] lightnvm: do device max sectors boundary check first

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Date:	Sat, 28 Nov 2015 16:49:25 +0100
From:	Matias Bjørling <m@...rling.me>
To:	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	axboe@...com
Cc:	hch@...radead.org, keith.busch@...el.com,
	sudipm.mukherjee@...il.com, ww.tao0320@...il.com,
	Matias Bjørling <m@...rling.me>
Subject: [PATCH 4/7] lightnvm: do device max sectors boundary check first

From: Wenwei Tao <ww.tao0320@...il.com>

do device max_phys_sect boundary check first, otherwise
we will allocate dma_pools for devices whose max sectors
are beyond lightnvm support and register them.

Signed-off-by: Wenwei Tao <ww.tao0320@...il.com>
Signed-off-by: Matias Bjørling <m@...rling.me>
---
 drivers/lightnvm/core.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index ea50fa5..ea6dba5 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -308,6 +308,12 @@ int nvm_register(struct request_queue *q, char *disk_name,
 	if (ret)
 		goto err_init;
 
+	if (dev->ops->max_phys_sect > 256) {
+		pr_info("nvm: max sectors supported is 256.\n");
+		ret = -EINVAL;
+		goto err_init;
+	}
+
 	if (dev->ops->max_phys_sect > 1) {
 		dev->ppalist_pool = dev->ops->create_dma_pool(dev->q,
 								"ppalist");
@@ -316,10 +322,6 @@ int nvm_register(struct request_queue *q, char *disk_name,
 			ret = -ENOMEM;
 			goto err_init;
 		}
-	} else if (dev->ops->max_phys_sect > 256) {
-		pr_info("nvm: max sectors supported is 256.\n");
-		ret = -EINVAL;
-		goto err_init;
 	}
 
 	down_write(&nvm_lock);
-- 
2.1.4

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