linux-kernel - [PATCH 1/1] MTD: cfi chip, fix lock imbalance

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Message-Id: <1260451437-29645-1-git-send-email-jslaby@suse.cz>
Date:	Thu, 10 Dec 2009 14:23:57 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	dwmw2@...radead.org
Cc:	linux-mtd@...ts.infradead.org, jirislaby@...il.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] MTD: cfi chip, fix lock imbalance

Stanse found a double unlock in get_chip. get_chip is called with
chip->mutex held and caller is responsible for unlocking it too.

Do not unlock the lock in get_chip on a fail path. This would mean
a double unlock.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/mtd/chips/cfi_cmdset_0002.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index 1d49e18..f3600e8 100644
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -569,7 +569,6 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
 
 			if (time_after(jiffies, timeo)) {
 				printk(KERN_ERR "Waiting for chip to be ready timed out.\n");
-				spin_unlock(chip->mutex);
 				return -EIO;
 			}
 			spin_unlock(chip->mutex);
-- 
1.6.5.5

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