diff options
| author | Stephen Boyd <swboyd@chromium.org> | 2019-08-14 03:40:53 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-08-21 01:23:15 +0300 |
| commit | ae367b7936408444afc76a8a3e141abede9ccbe4 (patch) | |
| tree | 77bbc4e90a512b2a968db2c3174726e48788d969 /drivers/base/power/wakeup.c | |
| parent | c8377adfa78103be5380200eb9dab764d7ca890e (diff) | |
| download | linux-ae367b7936408444afc76a8a3e141abede9ccbe4.tar.xz | |
PM / wakeup: Fix sysfs registration error path
We shouldn't call wakeup_source_destroy() from the error path in
wakeup_source_register() because that calls __pm_relax() which takes a
lock that isn't initialized until wakeup_source_add() is called. Add a
new function, wakeup_source_free(), that just does the bare minimum to
free a wakeup source that was created but hasn't been added yet and use
it from the two places it's needed. This fixes the following problem
seen on various x86 server boxes:
INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 12 PID: 1 Comm: swapper/0 Not tainted 5.3.0-rc4-
Hardware name: HP ProLiant XL420 Gen9/ProLiant XL420 Gen9, BIOS U19 12/27/2015
Call Trace:
dump_stack+0x62/0x9a
register_lock_class+0x95a/0x960
? __platform_driver_probe+0xcd/0x230
? __platform_create_bundle+0xc0/0xe0
? i8042_init+0x4ec/0x578
? do_one_initcall+0xfe/0x45a
? kernel_init_freeable+0x614/0x6a7
? kernel_init+0x11/0x138
? ret_from_fork+0x35/0x40
? is_dynamic_key+0xf0/0xf0
? rwlock_bug.part.0+0x60/0x60
? __debug_check_no_obj_freed+0x8e/0x250
__lock_acquire.isra.13+0x5f/0x830
? __debug_check_no_obj_freed+0x152/0x250
lock_acquire+0x107/0x220
? __pm_relax.part.2+0x21/0xa0
_raw_spin_lock_irqsave+0x35/0x50
? __pm_relax.part.2+0x21/0xa0
__pm_relax.part.2+0x21/0xa0
wakeup_source_destroy.part.3+0x18/0x190
wakeup_source_register+0x43/0x50
Fixes: c8377adfa781 ("PM / wakeup: Show wakeup sources stats in sysfs")
Reported-by: Qian Cai <cai@lca.pw>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/base/power/wakeup.c')
| -rw-r--r-- | drivers/base/power/wakeup.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c index 973675f24314..036469528f88 100644 --- a/drivers/base/power/wakeup.c +++ b/drivers/base/power/wakeup.c @@ -137,6 +137,13 @@ static void wakeup_source_record(struct wakeup_source *ws) spin_unlock_irqrestore(&deleted_ws.lock, flags); } +static void wakeup_source_free(struct wakeup_source *ws) +{ + ida_free(&wakeup_ida, ws->id); + kfree_const(ws->name); + kfree(ws); +} + /** * wakeup_source_destroy - Destroy a struct wakeup_source object. * @ws: Wakeup source to destroy. @@ -150,9 +157,7 @@ void wakeup_source_destroy(struct wakeup_source *ws) __pm_relax(ws); wakeup_source_record(ws); - ida_free(&wakeup_ida, ws->id); - kfree_const(ws->name); - kfree(ws); + wakeup_source_free(ws); } EXPORT_SYMBOL_GPL(wakeup_source_destroy); @@ -217,7 +222,7 @@ struct wakeup_source *wakeup_source_register(struct device *dev, if (ws) { ret = wakeup_source_sysfs_add(dev, ws); if (ret) { - wakeup_source_destroy(ws); + wakeup_source_free(ws); return NULL; } wakeup_source_add(ws); |