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/arch/powerpc/kernel/of_device.c b/arch/powerpc/kernel/of_device.c
index 89b911e..8f3db32 100644
--- a/arch/powerpc/kernel/of_device.c
+++ b/arch/powerpc/kernel/of_device.c
@@ -57,26 +57,21 @@
return tsize;
}
-int of_device_uevent(struct device *dev,
- char **envp, int num_envp, char *buffer, int buffer_size)
+int of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct of_device *ofdev;
const char *compat;
- int i = 0, length = 0, seen = 0, cplen, sl;
+ int seen = 0, cplen, sl;
if (!dev)
return -ENODEV;
ofdev = to_of_device(dev);
- if (add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "OF_NAME=%s", ofdev->node->name))
+ if (add_uevent_var(env, "OF_NAME=%s", ofdev->node->name))
return -ENOMEM;
- if (add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "OF_TYPE=%s", ofdev->node->type))
+ if (add_uevent_var(env, "OF_TYPE=%s", ofdev->node->type))
return -ENOMEM;
/* Since the compatible field can contain pretty much anything
@@ -85,9 +80,7 @@
compat = of_get_property(ofdev->node, "compatible", &cplen);
while (compat && *compat && cplen > 0) {
- if (add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "OF_COMPATIBLE_%d=%s", seen, compat))
+ if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat))
return -ENOMEM;
sl = strlen (compat) + 1;
@@ -96,25 +89,17 @@
seen++;
}
- if (add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "OF_COMPATIBLE_N=%d", seen))
+ if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen))
return -ENOMEM;
/* modalias is trickier, we add it in 2 steps */
- if (add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "MODALIAS="))
+ if (add_uevent_var(env, "MODALIAS="))
return -ENOMEM;
-
- sl = of_device_get_modalias(ofdev, &buffer[length-1],
- buffer_size-length);
- if (sl >= (buffer_size-length))
+ sl = of_device_get_modalias(ofdev, &env->buf[env->buflen-1],
+ sizeof(env->buf) - env->buflen);
+ if (sl >= (sizeof(env->buf) - env->buflen))
return -ENOMEM;
-
- length += sl;
-
- envp[i] = NULL;
+ env->buflen += sl;
return 0;
}
