Driver core: change add_uevent_var to use a struct
This changes the uevent buffer functions to use a struct instead of a
long list of parameters. It does no longer require the caller to do the
proper buffer termination and size accounting, which is currently wrong
in some places. It fixes a known bug where parts of the uevent
environment are overwritten because of wrong index calculations.
Many thanks to Mathieu Desnoyers for finding bugs and improving the
error handling.
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index d663e69..910a62d 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -67,20 +67,16 @@
#ifdef CONFIG_HOTPLUG
/* uevent helps with hotplug: modprobe -q $(MODALIAS) */
-static int i2c_device_uevent(struct device *dev, char **envp, int num_envp,
- char *buffer, int buffer_size)
+static int i2c_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct i2c_client *client = to_i2c_client(dev);
- int i = 0, length = 0;
/* by definition, legacy drivers can't hotplug */
if (dev->driver || !client->driver_name)
return 0;
- if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
- "MODALIAS=%s", client->driver_name))
+ if (add_uevent_var(env, "MODALIAS=%s", client->driver_name))
return -ENOMEM;
- envp[i] = NULL;
dev_dbg(dev, "uevent\n");
return 0;
}