linux-kernel - [PATCH] bsg: call idr_pre

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Date:	Wed, 01 Sep 2010 23:26:01 +0900
From:	Naohiro Aota <naota@...sp.net>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
	Jiri Kosina <jkosina@...e.cz>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Naohiro Aota <naota@...sp.net>, Daniel Mack <daniel@...aq.de>,
	linux-scsi@...r.kernel.org
Subject: [PATCH] bsg: call idr_pre_get() outside the lock.

The idr_pre_get() kernel-doc says "This function should be called
prior to locking and calling the idr_get_new* functions.", but the
idr_pre_get() calling in bsg_register_queue() is put inside
mutex_lock(). Let's fix it.

Signed-off-by: Naohiro Aota <naota@...sp.net>
---
 block/bsg.c |   10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/block/bsg.c b/block/bsg.c
index 82d5882..5fd8dd1 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -1010,13 +1010,11 @@ int bsg_register_queue(struct request_queue *q, struct device *parent,
 	bcd = &q->bsg_dev;
 	memset(bcd, 0, sizeof(*bcd));
 
-	mutex_lock(&bsg_mutex);
-
 	ret = idr_pre_get(&bsg_minor_idr, GFP_KERNEL);
-	if (!ret) {
-		ret = -ENOMEM;
-		goto unlock;
-	}
+	if (!ret)
+		return -ENOMEM;
+
+	mutex_lock(&bsg_mutex);
 
 	ret = idr_get_new(&bsg_minor_idr, bcd, &minor);
 	if (ret < 0)
-- 
1.7.2

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