linux-kernel - [PATCH 3.4 74/91] genhd: fix leftover might_sleep() in blk_free

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Message-Id: <1422418236-12852-148-git-send-email-lizf@kernel.org>
Date:	Wed, 28 Jan 2015 12:08:35 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...com>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 74/91] genhd: fix leftover might_sleep() in blk_free_devt()

From: Jens Axboe <axboe@...com>

3.4.105-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 46f341ffcfb5d8530f7d1e60f3be06cce6661b62 upstream.

Commit 2da78092 changed the locking from a mutex to a spinlock,
so we now longer sleep in this context. But there was a leftover
might_sleep() in there, which now triggers since we do the final
free from an RCU callback. Get rid of it.

Reported-by: Pontus Fuchs <pontus.fuchs@...il.com>
Signed-off-by: Jens Axboe <axboe@...com>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 block/genhd.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 54867f4..60f7e6c 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -447,8 +447,6 @@ int blk_alloc_devt(struct hd_struct *part, dev_t *devt)
  */
 void blk_free_devt(dev_t devt)
 {
-	might_sleep();
-
 	if (devt == MKDEV(0, 0))
 		return;
 
-- 
1.9.1

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