Elf_Shdr *sechdrs,
const char *secstrings)
{
- return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
+ return find_sec(hdr, sechdrs, secstrings, ".data..percpu");
}
static void percpu_modcopy(struct module *mod,
{
int cpu;
- INIT_LIST_HEAD(&mod->modules_which_use_me);
+ INIT_LIST_HEAD(&mod->source_list);
+ INIT_LIST_HEAD(&mod->target_list);
for_each_possible_cpu(cpu) {
per_cpu_ptr(mod->refptr, cpu)->incs = 0;
per_cpu_ptr(mod->refptr, cpu)->decs = 0;
/* modules using other modules */
struct module_use
{
- struct list_head list;
- struct module *module_which_uses;
+ struct list_head source_list;
+ struct list_head target_list;
+ struct module *source, *target;
};
/* Does a already use b? */
{
struct module_use *use;
- list_for_each_entry(use, &b->modules_which_use_me, list) {
- if (use->module_which_uses == a) {
+ list_for_each_entry(use, &b->source_list, source_list) {
+ if (use->source == a) {
DEBUGP("%s uses %s!\n", a->name, b->name);
return 1;
}
return 0;
}
+/*
+ * Module a uses b
+ * - we add 'a' as a "source", 'b' as a "target" of module use
+ * - the module_use is added to the list of 'b' sources (so
+ * 'b' can walk the list to see who sourced them), and of 'a'
+ * targets (so 'a' can see what modules it targets).
+ */
+static int add_module_usage(struct module *a, struct module *b)
+{
+ int no_warn;
+ struct module_use *use;
+
+ DEBUGP("Allocating new usage for %s.\n", a->name);
+ use = kmalloc(sizeof(*use), GFP_ATOMIC);
+ if (!use) {
+ printk(KERN_WARNING "%s: out of memory loading\n", a->name);
+ return -ENOMEM;
+ }
+
+ use->source = a;
+ use->target = b;
+ list_add(&use->source_list, &b->source_list);
+ list_add(&use->target_list, &a->target_list);
+ no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
+ return 0;
+}
+
/* Module a uses b */
int use_module(struct module *a, struct module *b)
{
struct module_use *use;
int no_warn, err;
- if (b == NULL || already_uses(a, b))
- return 0;
+ if (b == NULL || already_uses(a, b)) return 1;
/* If we're interrupted or time out, we fail. */
- err = strong_try_module_get(b);
+ if (wait_event_interruptible_timeout(
+ module_wq, (err = strong_try_module_get(b)) != -EBUSY,
+ 30 * HZ) <= 0) {
+ printk("%s: gave up waiting for init of module %s.\n",
+ a->name, b->name);
+ return 0;
+ }
+
+ /* If strong_try_module_get() returned a different error, we fail. */
if (err)
- return err;
+ return 0;
- DEBUGP("Allocating new usage for %s.\n", a->name);
- use = kmalloc(sizeof(*use), GFP_ATOMIC);
- if (!use) {
- printk("%s: out of memory loading\n", a->name);
+ err = add_module_usage(a, b);
+ if (err) {
module_put(b);
- return -ENOMEM;
+ return 0;
}
-
- use->module_which_uses = a;
- list_add(&use->list, &b->modules_which_use_me);
- no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
- return 0;
+ return 1;
}
EXPORT_SYMBOL_GPL(use_module);
/* Clear the unload stuff of the module. */
static void module_unload_free(struct module *mod)
{
- struct module *i;
+ struct module_use *use, *tmp;
- list_for_each_entry(i, &modules, list) {
- struct module_use *use;
-
- list_for_each_entry(use, &i->modules_which_use_me, list) {
- if (use->module_which_uses == mod) {
- DEBUGP("%s unusing %s\n", mod->name, i->name);
- module_put(i);
- list_del(&use->list);
- kfree(use);
- sysfs_remove_link(i->holders_dir, mod->name);
- /* There can be at most one match. */
- break;
- }
- }
+ list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
+ struct module *i = use->target;
+ DEBUGP("%s unusing %s\n", mod->name, i->name);
+ module_put(i);
+ list_del(&use->source_list);
+ list_del(&use->target_list);
+ kfree(use);
+ sysfs_remove_link(i->holders_dir, mod->name);
}
}
goto out;
}
- if (!list_empty(&mod->modules_which_use_me)) {
+ if (!list_empty(&mod->source_list)) {
/* Other modules depend on us: get rid of them first. */
ret = -EWOULDBLOCK;
goto out;
/* Always include a trailing , so userspace can differentiate
between this and the old multi-field proc format. */
- list_for_each_entry(use, &mod->modules_which_use_me, list) {
+ list_for_each_entry(use, &mod->source_list, source_list) {
printed_something = 1;
- seq_printf(m, "%s,", use->module_which_uses->name);
+ seq_printf(m, "%s,", use->source->name);
}
if (mod->init != NULL && mod->exit == NULL) {
int use_module(struct module *a, struct module *b)
{
- return strong_try_module_get(b);
+ return strong_try_module_get(b) == 0;
}
EXPORT_SYMBOL_GPL(use_module);
struct module *owner;
const struct kernel_symbol *sym;
const unsigned long *crc;
- DEFINE_WAIT(wait);
- int err;
- long timeleft = 30 * HZ;
-again:
sym = find_symbol(name, &owner, &crc,
!(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
- if (!sym)
- return NULL;
-
- if (!check_version(sechdrs, versindex, name, mod, crc, owner))
- return NULL;
-
- prepare_to_wait(&module_wq, &wait, TASK_INTERRUPTIBLE);
- err = use_module(mod, owner);
- if (likely(!err) || err != -EBUSY || signal_pending(current)) {
- finish_wait(&module_wq, &wait);
- return err ? NULL : sym;
+ /* use_module can fail due to OOM,
+ or module initialization or unloading */
+ if (sym) {
+ if (!check_version(sechdrs, versindex, name, mod, crc, owner)
+ || !use_module(mod, owner))
+ sym = NULL;
}
-
- /* Module is still loading. Drop lock and wait. */
- mutex_unlock(&module_mutex);
- timeleft = schedule_timeout(timeleft);
- mutex_lock(&module_mutex);
- finish_wait(&module_wq, &wait);
-
- /* Module might be gone entirely, or replaced. Re-lookup. */
- if (timeleft)
- goto again;
-
- printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n",
- mod->name, owner->name);
- return NULL;
+ return sym;
}
/*
long err = 0;
void *ptr = NULL; /* Stops spurious gcc warning */
unsigned long symoffs, stroffs, *strmap;
+ void __percpu *percpu;
mm_segment_t old_fs;
goto free_mod;
sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
}
+ /* Keep this around for failure path. */
+ percpu = mod_percpu(mod);
/* Determine total sizes, and put offsets in sh_entsize. For now
this is done generically; there doesn't appear to be any
module_free(mod, mod->module_core);
/* mod will be freed with core. Don't access it beyond this line! */
free_percpu:
- percpu_modfree(mod);
+ free_percpu(percpu);
free_mod:
kfree(args);
kfree(strmap);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff