linux-kernel - [PATCH 3/9] lightnvm: refactor spin_unlock in gennvm_get

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Message-Id: <1449397551-16525-4-git-send-email-m@bjorling.me>
Date:	Sun,  6 Dec 2015 11:25:45 +0100
From:	Matias Bjørling <m@...rling.me>
To:	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	axboe@...com
Cc:	Wenwei Tao <ww.tao0320@...il.com>,
	Matias Bjørling <m@...rling.me>
Subject: [PATCH 3/9] lightnvm: refactor spin_unlock in gennvm_get_blk

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

The spin_unlock is duplicated multiple times. Jump to a single unlock
to improve the code flow.

Signed-off-by: Wenwei Tao <ww.tao0320@...il.com>
Signed-off-by: Matias Bjørling <m@...rling.me>
---
 drivers/lightnvm/gennvm.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
index 35dde84..ce60254 100644
--- a/drivers/lightnvm/gennvm.c
+++ b/drivers/lightnvm/gennvm.c
@@ -262,14 +262,11 @@ static struct nvm_block *gennvm_get_blk(struct nvm_dev *dev,
 	if (list_empty(&lun->free_list)) {
 		pr_err_ratelimited("gennvm: lun %u have no free pages available",
 								lun->vlun.id);
-		spin_unlock(&vlun->lock);
 		goto out;
 	}
 
-	while (!is_gc && lun->vlun.nr_free_blocks < lun->reserved_blocks) {
-		spin_unlock(&vlun->lock);
+	if (!is_gc && lun->vlun.nr_free_blocks < lun->reserved_blocks)
 		goto out;
-	}
 
 	blk = list_first_entry(&lun->free_list, struct nvm_block, list);
 	list_move_tail(&blk->list, &lun->used_list);
@@ -278,8 +275,8 @@ static struct nvm_block *gennvm_get_blk(struct nvm_dev *dev,
 	lun->vlun.nr_free_blocks--;
 	lun->vlun.nr_inuse_blocks++;
 
-	spin_unlock(&vlun->lock);
 out:
+	spin_unlock(&vlun->lock);
 	return blk;
 }
 
-- 
2.1.4

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