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o Expand an exclusive lock scope to prevent a race between two

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simultaneous module_register().

Original work done by:	Alex Lyashkov
Reviewed by:		jhb
MFC after:		2 weeks
This commit is contained in:
Maxim Konovalov 2006-06-15 08:53:09 +00:00
parent cecd2b6c70
commit 059d68dea6
1 changed files with 5 additions and 5 deletions
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10
sys/kern/kern_module.c
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@ -136,20 +136,20 @@ module_register(const moduledata_t *data, linker_file_t container)
size_t namelen;
module_t newmod;
MOD_SLOCK;
MOD_XLOCK;
newmod = module_lookupbyname(data->name);
if (newmod != NULL) {
MOD_SUNLOCK;
MOD_XUNLOCK;
printf("module_register: module %s already exists!\n",
data->name);
return (EEXIST);
}
MOD_SUNLOCK;
namelen = strlen(data->name) + 1;
newmod = malloc(sizeof(struct module) + namelen, M_MODULE, M_WAITOK);
if (newmod == NULL)
if (newmod == NULL) {
MOD_XUNLOCK;
return (ENOMEM);
MOD_XLOCK;
}
newmod->refs = 1;
newmod->id = nextid++;
newmod->name = (char *)(newmod + 1);