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modules: don't fail to load on unknown parameters.

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Although parameters are supposed to be part of the kernel API, experimental
parameters are often removed.  In addition, downgrading a kernel might cause
previously-working modules to fail to load.

On balance, it's probably better to warn, and load the module anyway.
This may let through a typo, but at least the logs will show it.

Reported-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2013-07-02 15:35:12 +09:30
parent 86f120031a
commit 54041d8a73
1 changed files with 12 additions and 1 deletions
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13
kernel/module.c
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@ -3212,6 +3212,17 @@ out:
return err; return err;
} }
static int unknown_module_param_cb(char *param, char *val, const char *modname)
{
/* Check for magic 'dyndbg' arg */
int ret = ddebug_dyndbg_module_param_cb(param, val, modname);
if (ret != 0) {
printk(KERN_WARNING "%s: unknown parameter '%s' ignored\n",
modname, param);
}
return 0;
}
/* Allocate and load the module: note that size of section 0 is always /* Allocate and load the module: note that size of section 0 is always
zero, and we rely on this for optional sections. */ zero, and we rely on this for optional sections. */
static int load_module(struct load_info *info, const char __user *uargs, static int load_module(struct load_info *info, const char __user *uargs,
@ -3298,7 +3309,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
/* Module is ready to execute: parsing args may do that. */ /* Module is ready to execute: parsing args may do that. */
err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp,
-32768, 32767, &ddebug_dyndbg_module_param_cb); -32768, 32767, unknown_module_param_cb);
if (err < 0) if (err < 0)
goto bug_cleanup; goto bug_cleanup;