linux-kernel - [21/45] i2c: Do not use device name after device

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Date:	Tue, 30 Mar 2010 15:48:41 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>,
	Jean Delvare <khali@...ux-fr.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [21/45] i2c: Do not use device name after device_unregister

2.6.27-stable review patch.  If anyone has any objections, please let us know.

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


From: Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>

In Linus' tree:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c556752109794a5ff199b80a1673336b4df8433a

dev_dbg outputs dev_name, which is released with device_unregister. This bug
resulted in output like this:

i2c Xy2�0: adapter [SMBus I801 adapter at 1880] unregistered

The right output would be:
i2c i2c-0: adapter [SMBus I801 adapter at 1880] unregistered

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
Signed-off-by: Jean Delvare <khali@...ux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/i2c/i2c-core.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -644,6 +644,9 @@ int i2c_del_adapter(struct i2c_adapter *
 		}
 	}
 
+	/* device name is gone after device_unregister */
+	dev_dbg(&adap->dev, "adapter [%s] unregistered\n", adap->name);
+
 	/* clean up the sysfs representation */
 	init_completion(&adap->dev_released);
 	device_unregister(&adap->dev);
@@ -654,8 +657,6 @@ int i2c_del_adapter(struct i2c_adapter *
 	/* free bus id */
 	idr_remove(&i2c_adapter_idr, adap->nr);
 
-	dev_dbg(&adap->dev, "adapter [%s] unregistered\n", adap->name);
-
 	/* Clear the device structure in case this adapter is ever going to be
 	   added again */
 	memset(&adap->dev, 0, sizeof(adap->dev));


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