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/w1/w1.c b/drivers/w1/w1.c
index a593f90..0702173 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -197,7 +197,7 @@
.fops = &w1_default_fops,
};
-static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size);
+static int w1_uevent(struct device *dev, struct kobj_uevent_env *env);
static struct bus_type w1_bus_type = {
.name = "w1",
@@ -396,13 +396,12 @@
}
#ifdef CONFIG_HOTPLUG
-static int w1_uevent(struct device *dev, char **envp, int num_envp,
- char *buffer, int buffer_size)
+static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct w1_master *md = NULL;
struct w1_slave *sl = NULL;
char *event_owner, *name;
- int err, cur_index=0, cur_len=0;
+ int err;
if (dev->driver == &w1_master_driver) {
md = container_of(dev, struct w1_master, dev);
@@ -423,23 +422,19 @@
if (dev->driver != &w1_slave_driver || !sl)
return 0;
- err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size,
- &cur_len, "W1_FID=%02X", sl->reg_num.family);
+ err = add_uevent_var(env, "W1_FID=%02X", sl->reg_num.family);
if (err)
return err;
- err = add_uevent_var(envp, num_envp, &cur_index, buffer, buffer_size,
- &cur_len, "W1_SLAVE_ID=%024LX",
- (unsigned long long)sl->reg_num.id);
- envp[cur_index] = NULL;
+ err = add_uevent_var(env, "W1_SLAVE_ID=%024LX",
+ (unsigned long long)sl->reg_num.id);
if (err)
return err;
return 0;
};
#else
-static int w1_uevent(struct device *dev, char **envp, int num_envp,
- char *buffer, int buffer_size)
+static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
{
return 0;
}