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authorLinus Torvalds <torvalds@linux-foundation.org>2010-05-21 17:15:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-21 17:15:44 -0700
commita8251096b427283c47e7d8f9568be6b388dd68ec (patch)
treeedc9747e30b4b4413aa99acfbd3104d81b1c303b /kernel/module.c
parent27a3353a4525afe984f3b793681869d636136b69 (diff)
parent480b02df3aa9f07d1c7df0cd8be7a5ca73893455 (diff)
downloadlinux-a8251096b427283c47e7d8f9568be6b388dd68ec.tar.bz2
Merge branch 'modules' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus
* 'modules' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus: module: drop the lock while waiting for module to complete initialization. MODULE_DEVICE_TABLE(isapnp, ...) does nothing hisax_fcpcipnp: fix broken isapnp device table. isapnp: move definitions to mod_devicetable.h so file2alias can reach them.
Diffstat (limited to 'kernel/module.c')
-rw-r--r--kernel/module.c59
1 files changed, 37 insertions, 22 deletions
diff --git a/kernel/module.c b/kernel/module.c
index 3c4fc4bb4b82..a8014bfb5a4e 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -565,33 +565,26 @@ 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 1;
-
- /* If we're interrupted or time out, we fail. */
- 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);
+ if (b == NULL || already_uses(a, b))
return 0;
- }
- /* If strong_try_module_get() returned a different error, we fail. */
+ /* If we're interrupted or time out, we fail. */
+ err = strong_try_module_get(b);
if (err)
- return 0;
+ return err;
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);
module_put(b);
- return 0;
+ return -ENOMEM;
}
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 1;
+ return 0;
}
EXPORT_SYMBOL_GPL(use_module);
@@ -884,7 +877,7 @@ static inline void module_unload_free(struct module *mod)
int use_module(struct module *a, struct module *b)
{
- return strong_try_module_get(b) == 0;
+ return strong_try_module_get(b);
}
EXPORT_SYMBOL_GPL(use_module);
@@ -1055,17 +1048,39 @@ static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
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);
- /* 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;
- }
- return sym;
+ 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;
+ }
+
+ /* 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;
}
/*