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param: fix module param locks when !CONFIG_SYSFS.

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As Dan Streetman points out, the entire point of locking for is to
stop sysfs accesses, so they're elided entirely in the !SYSFS case.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2015-06-26 06:44:38 +09:30
parent 38183b9c31
commit cf2fde7b39
3 changed files with 24 additions and 5 deletions
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kernel/module.c
+8 -1
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@@ -1820,6 +1820,10 @@ static void mod_sysfs_fini(struct module *mod)
mod_kobject_put(mod);
}
static void init_param_lock(struct module *mod)
{
mutex_init(&mod->param_lock);
}
#else /* !CONFIG_SYSFS */
static int mod_sysfs_setup(struct module *mod,
@@ -1842,6 +1846,9 @@ static void del_usage_links(struct module *mod)
{
}
static void init_param_lock(struct module *mod)
{
}
#endif /* CONFIG_SYSFS */
static void mod_sysfs_teardown(struct module *mod)
@@ -3442,7 +3449,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
if (err)
goto unlink_mod;
mutex_init(&mod->param_lock);
init_param_lock(mod);
/* Now we've got everything in the final locations, we can
* find optional sections. */