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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
Download Patch File Download Diff File Expand all files Collapse all files

37
arch/powerpc/kernel/of_device.c
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@@ -57,26 +57,21 @@ ssize_t of_device_get_modalias(struct of_device *ofdev,
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 @@ int of_device_uevent(struct device *dev,
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 @@ int of_device_uevent(struct device *dev,
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;
}