linux-kernel - [PATCH v2 2/5] lightnvm: check for max sector

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Date:	Tue, 24 Nov 2015 16:04:57 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Matias Bjorling <mb@...htnvm.io>
Cc:	linux-kernel@...r.kernel.org,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH v2 2/5] lightnvm: check for max sector

If max_phys_sect is greater than 256 then its obviously greater than 1
so we will never hit the else-if block. And moreover, if we check for
max_phys_sect at the end then it might happen that we initialize
successfully only to see at the end that this is not supported.
Lets check for max_phys_sect at the beginning and continue
initialization only if it is supported.

Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
---
 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 e338048..2ab561f 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -296,6 +296,11 @@ int nvm_register(struct request_queue *q, char *disk_name,
 	if (!ops->identity)
 		return -EINVAL;
 
+	if (ops->max_phys_sect > 256) {
+		pr_info("nvm: max sectors supported is 256.\n");
+		return -EINVAL;
+	}
+
 	dev = kzalloc(sizeof(struct nvm_dev), GFP_KERNEL);
 	if (!dev)
 		return -ENOMEM;
@@ -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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