This is a note to let you know that I've just added the patch titled
i2c: Unregister dummy devices last on adapter removal
to the 2.6.32-longterm tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/longterm/longterm-queue-2.6.32.git;a=summary
The filename of the patch is:
i2c-unregister-dummy-devices-last-on-adapter-removal.patch
and it can be found in the queue-2.6.32 subdirectory.
If you, or anyone else, feels it should not be added to the 2.6.32 longterm
tree,
please let <[email protected]> know about it.
>From 5219bf884b6e2b54e734ca1799b6f0014bb2b4b7 Mon Sep 17 00:00:00 2001
From: Jean Delvare <[email protected]>
Date: Fri, 14 Jan 2011 22:03:49 +0100
Subject: i2c: Unregister dummy devices last on adapter removal
From: Jean Delvare <[email protected]>
commit 5219bf884b6e2b54e734ca1799b6f0014bb2b4b7 upstream.
Remove real devices first and dummy devices last. This gives device
driver which instantiated dummy devices themselves a chance to clean
them up before we do.
Signed-off-by: Jean Delvare <[email protected]>
Tested-by: Hans Verkuil <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/i2c/i2c-core.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -745,6 +745,14 @@ static int i2c_do_del_adapter(struct dev
static int __unregister_client(struct device *dev, void *dummy)
{
struct i2c_client *client = i2c_verify_client(dev);
+ if (client && strcmp(client->name, "dummy"))
+ i2c_unregister_device(client);
+ return 0;
+}
+
+static int __unregister_dummy(struct device *dev, void *dummy)
+{
+ struct i2c_client *client = i2c_verify_client(dev);
if (client)
i2c_unregister_device(client);
return 0;
@@ -793,8 +801,12 @@ int i2c_del_adapter(struct i2c_adapter *
}
/* Detach any active clients. This can't fail, thus we do not
- checking the returned value. */
+ * check the returned value. This is a two-pass process, because
+ * we can't remove the dummy devices during the first pass: they
+ * could have been instantiated by real devices wishing to clean
+ * them up properly, so we give them a chance to do that first. */
res = device_for_each_child(&adap->dev, NULL, __unregister_client);
+ res = device_for_each_child(&adap->dev, NULL, __unregister_dummy);
#ifdef CONFIG_I2C_COMPAT
class_compat_remove_link(i2c_adapter_compat_class, &adap->dev,
Patches currently in longterm-queue-2.6.32 which might be from
[email protected] are
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