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When loading a module that contains a sysctl which is already compiled

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in the kernel, the sysctl_register() call would fail, as expected.
However, when unloading this module again, the kernel would then panic
in sysctl_unregister().  Print a message error instead.

Submitted by:	Nicolai Petri <nicolai@catpipe.net>
Reviewed by:	imp
Approved by:	re@ (jhb)
This commit is contained in:
Maxime Henrion 2003-05-29 21:19:18 +00:00
parent 1b2a19ce0e
commit 193f2edbf9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=115391
1 changed files with 24 additions and 1 deletions
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25
sys/kern/kern_sysctl.c
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@ -153,7 +153,30 @@ sysctl_register_oid(struct sysctl_oid *oidp)
void
sysctl_unregister_oid(struct sysctl_oid *oidp)
{
SLIST_REMOVE(oidp->oid_parent, oidp, sysctl_oid, oid_link);
struct sysctl_oid *p;
int error;
error = ENOENT;
if (oidp->oid_number == OID_AUTO) {
error = EINVAL;
} else {
SLIST_FOREACH(p, oidp->oid_parent, oid_link) {
if (p == oidp) {
SLIST_REMOVE(oidp->oid_parent, oidp,
sysctl_oid, oid_link);
error = 0;
break;
}
}
}
/*
* This can happen when a module fails to register and is
* being unloaded afterwards. It should not be a panic()
* for normal use.
*/
if (error)
printf("%s: failed to unregister sysctl\n", __func__);
}
/* Initialize a new context to keep track of dynamically added sysctls. */