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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 <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Cornelia Huck <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Kay Sievers 2007-08-14 15:15:12 +02:00 • committed by Greg Kroah-Hartman
commit 7eff2e7a8b
47 changed files with 300 additions and 636 deletions
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33
sound/aoa/soundbus/core.c
View file

@ -56,13 +56,12 @@ static int soundbus_probe(struct device *dev)
}
static int soundbus_uevent(struct device *dev, char **envp, int num_envp,
char *buffer, int buffer_size)
static int soundbus_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct soundbus_dev * soundbus_dev;
struct of_device * of;
const char *compat;
int retval = 0, i = 0, length = 0;
int retval = 0;
int cplen, seen = 0;
if (!dev)
@ -75,15 +74,11 @@ static int soundbus_uevent(struct device *dev, char **envp, int num_envp,
of = &soundbus_dev->ofdev;
/* stuff we want to pass to /sbin/hotplug */
retval = add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"OF_NAME=%s", of->node->name);
retval = add_uevent_var(env, "OF_NAME=%s", of->node->name);
if (retval)
return retval;
retval = add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"OF_TYPE=%s", of->node->type);
retval = add_uevent_var(env, "OF_TYPE=%s", of->node->type);
if (retval)
return retval;
@ -93,27 +88,19 @@ static int soundbus_uevent(struct device *dev, char **envp, int num_envp,
compat = of_get_property(of->node, "compatible", &cplen);
while (compat && cplen > 0) {
int tmp = length;
retval = add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"OF_COMPATIBLE_%d=%s", seen, compat);
int tmp = env->buflen;
retval = add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
if (retval)
return retval;
compat += length - tmp;
cplen -= length - tmp;
compat += env->buflen - tmp;
cplen -= env->buflen - tmp;
seen += 1;
}
retval = add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"OF_COMPATIBLE_N=%d", seen);
retval = add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
if (retval)
return retval;
retval = add_uevent_var(envp, num_envp, &i,
buffer, buffer_size, &length,
"MODALIAS=%s", soundbus_dev->modalias);
envp[i] = NULL;
retval = add_uevent_var(env, "MODALIAS=%s", soundbus_dev->modalias);
return retval;
}