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Driver core: change add_uevent_var to use a struct

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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>
This commit is contained in:
Kay Sievers 2007-08-14 15:15:12 +02:00 • committed by Greg Kroah-Hartman
parent 8380770c84
commit 7eff2e7a8b
47 changed files with 300 additions and 636 deletions
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8
drivers/i2c/i2c-core.c
View file

@ -67,20 +67,16 @@ static int i2c_device_match(struct device *dev, struct device_driver *drv)
#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;
}