linux-kernel - Re: [PATCH] i2c: immediately mark ourselves as registered

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Date:	Mon, 14 Mar 2016 19:49:03 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thierry Reding <thierry.reding@...il.com>
Subject: Re: [PATCH] i2c: immediately mark ourselves as registered

On Mon, Mar 14, 2016 at 10:53:26AM +0100, Wolfram Sang wrote:
> Mark the i2c bus as registered right after the the bus_register call,
> not at the end of init. Otherwise, we can't register our own dummy
> driver.
> 
> Reported-by: Thierry Reding <thierry.reding@...il.com>
> Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
> Fixes: 95026658c46ea2 ("i2c: do not use internal data from driver core")
> ---

I think it should be:


diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index f4726cd..065cd83 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -2105,6 +2105,9 @@ static int __init i2c_init(void)
 	retval = bus_register(&i2c_bus_type);
 	if (retval)
 		return retval;
+
+	is_registered = true;
+
 #ifdef CONFIG_I2C_COMPAT
 	i2c_adapter_compat_class = class_compat_register("i2c-adapter");
 	if (!i2c_adapter_compat_class) {
@@ -2119,7 +2122,6 @@ static int __init i2c_init(void)
 	if (IS_ENABLED(CONFIG_OF_DYNAMIC))
 		WARN_ON(of_reconfig_notifier_register(&i2c_of_notifier));
 
-	is_registered = true;
 	return 0;
 
 class_err:
@@ -2128,6 +2130,7 @@ class_err:
 bus_err:
 #endif
 	bus_unregister(&i2c_bus_type);
+	is_registered = false;
 	return retval;
 }
 

otherwise even if i2c bus fails to register the flag says that i2c is registered.
Sorry again for the previous patch.

regards
sudip