From 34e4e2fef4c7a2f7699b3d25e48d871d3ac4c3e7 Mon Sep 17 00:00:00 2001 From: "Denis V. Lunev" Date: Tue, 20 May 2008 13:59:48 +0400 Subject: [PATCH] modules: proper cleanup of kobject without CONFIG_SYSFS kobject: '' (ffffffffa0104050): is not initialized, yet kobject_put() is being called. ------------[ cut here ]------------ WARNING: at /home/den/src/linux-netns26/lib/kobject.c:583 kobject_put+0x53/0x55() Modules linked in: ipv6 nfsd lockd nfs_acl auth_rpcgss sunrpc exportfs ide_cd_mod cdrom button [last unloaded: pktgen] comm: rmmod Tainted: G W 2.6.26-rc3 #585 Call Trace: [] warn_on_slowpath+0x58/0x7a [] ? printk+0x67/0x69 [] ? printk+0x67/0x69 [] kobject_put+0x53/0x55 [] free_module+0x87/0xfa [] sys_delete_module+0x178/0x1e1 [] ? lockdep_sys_exit_thunk+0x35/0x67 [] ? trace_hardirqs_on_thunk+0x35/0x3a [] system_call_after_swapgs+0x7b/0x80 ---[ end trace 8f5aafa7f6406cf8 ]--- mod->mkobj.kobj is not initialized without CONFIG_SYSFS. Do not call kobject_put in this case. Signed-off-by: Denis V. Lunev Cc: Rusty Russell Cc: Kay Sievers Signed-off-by: Rusty Russell --- kernel/module.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/kernel/module.c b/kernel/module.c index e6daf9a320..5f80478b74 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -1337,7 +1337,19 @@ out_unreg: kobject_put(&mod->mkobj.kobj); return err; } -#endif + +static void mod_sysfs_fini(struct module *mod) +{ + kobject_put(&mod->mkobj.kobj); +} + +#else /* CONFIG_SYSFS */ + +static void mod_sysfs_fini(struct module *mod) +{ +} + +#endif /* CONFIG_SYSFS */ static void mod_kobject_remove(struct module *mod) { @@ -1345,7 +1357,7 @@ static void mod_kobject_remove(struct module *mod) module_param_sysfs_remove(mod); kobject_put(mod->mkobj.drivers_dir); kobject_put(mod->holders_dir); - kobject_put(&mod->mkobj.kobj); + mod_sysfs_fini(mod); } /* -- 2.39.5