Patch "i2c: mux: use proper dev when removing "channel-X" symlinks" has been added to the 4.0-stable tree

Patch "i2c: mux: use proper dev when removing "channel-X" symlinks" has been added to the 4.0-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    i2c: mux: use proper dev when removing "channel-X" symlinks

to the 4.0-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     i2c-mux-use-proper-dev-when-removing-channel-x-symlinks.patch
and it can be found in the queue-4.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 133778482ec6c8fde69406be380333963627c17a Mon Sep 17 00:00:00 2001
From: Wolfram Sang <wsa+renesas@sang-engineering.com>
Date: Thu, 23 Apr 2015 10:29:09 +0200
Subject: i2c: mux: use proper dev when removing "channel-X" symlinks

From: Wolfram Sang <wsa+renesas@sang-engineering.com>

commit 133778482ec6c8fde69406be380333963627c17a upstream.

Those symlinks are created for the mux_dev, so we need to remove it from
there. Currently, it breaks for muxes where the mux_dev is not the device
of the parent adapter like this:

[   78.234644] WARNING: CPU: 0 PID: 365 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x5c/0x78()
[   78.242438] sysfs: cannot create duplicate filename '/devices/platform/i2cbus@8/channel-0'

Remove confusing comments while we are here.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Fixes: c9449affad2ae0
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/i2c/i2c-mux.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- a/drivers/i2c/i2c-mux.c
+++ b/drivers/i2c/i2c-mux.c
@@ -32,8 +32,9 @@ struct i2c_mux_priv {
 	struct i2c_algorithm algo;
 
 	struct i2c_adapter *parent;
-	void *mux_priv;	/* the mux chip/device */
-	u32  chan_id;	/* the channel id */
+	struct device *mux_dev;
+	void *mux_priv;
+	u32 chan_id;
 
 	int (*select)(struct i2c_adapter *, void *mux_priv, u32 chan_id);
 	int (*deselect)(struct i2c_adapter *, void *mux_priv, u32 chan_id);
@@ -119,6 +120,7 @@ struct i2c_adapter *i2c_add_mux_adapter(
 
 	/* Set up private adapter data */
 	priv->parent = parent;
+	priv->mux_dev = mux_dev;
 	priv->mux_priv = mux_priv;
 	priv->chan_id = chan_id;
 	priv->select = select;
@@ -203,7 +205,7 @@ void i2c_del_mux_adapter(struct i2c_adap
 	char symlink_name[20];
 
 	snprintf(symlink_name, sizeof(symlink_name), "channel-%u", priv->chan_id);
-	sysfs_remove_link(&adap->dev.parent->kobj, symlink_name);
+	sysfs_remove_link(&priv->mux_dev->kobj, symlink_name);
 
 	sysfs_remove_link(&priv->adap.dev.kobj, "mux_device");
 	i2c_del_adapter(adap);


Patches currently in stable-queue which might be from wsa+renesas@sang-engineering.com are

queue-4.0/i2c-mux-use-proper-dev-when-removing-channel-x-symlinks.patch