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

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Message-Id: <1448191836-1621-1-git-send-email-ww.tao0320@gmail.com>
Date:	Sun, 22 Nov 2015 19:30:36 +0800
From:	Wenwei Tao <ww.tao0320@...il.com>
To:	mb@...htnvm.io
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] lightnvm: do device max sectors boundary check first

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>
---
 drivers/lightnvm/core.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index f659e60..7ecf848 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -312,6 +312,11 @@ int nvm_register(struct request_queue *q, char *disk_name,
 	list_add(&dev->devices, &nvm_devices);
 	up_write(&nvm_lock);
 
+	if (dev->ops->max_phys_sect > 256) {
+		pr_info("nvm: max sectors supported is 256.\n");
+		return -EINVAL;
+	}
+
 	if (dev->ops->max_phys_sect > 1) {
 		dev->ppalist_pool = dev->ops->create_dma_pool(dev->q,
 								"ppalist");
@@ -319,9 +324,6 @@ int nvm_register(struct request_queue *q, char *disk_name,
 			pr_err("nvm: could not create ppa pool\n");
 			return -ENOMEM;
 		}
-	} else if (dev->ops->max_phys_sect > 256) {
-		pr_info("nvm: max sectors supported is 256.\n");
-		return -EINVAL;
 	}
 
 	return 0;
-- 
1.9.1

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