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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-07-15 13:03:48 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-07-23 09:46:27 +0200 |
| commit | 2933954b71f10d392764f95eec0f0aa2d103054b (patch) | |
| tree | 467c9d9e5377f4c4dd77b63c026bfd0e042f42d3 /drivers/base | |
| parent | ACPI: EC: Return bool from acpi_ec_dispatch_gpe() (diff) | |
| download | linux-2933954b71f10d392764f95eec0f0aa2d103054b.tar.xz linux-2933954b71f10d392764f95eec0f0aa2d103054b.zip | |
PM: sleep: Fix possible overflow in pm_system_cancel_wakeup()
It is not actually guaranteed that pm_abort_suspend will be
nonzero when pm_system_cancel_wakeup() is called which may lead to
subtle issues, so make it use atomic_dec_if_positive() instead of
atomic_dec() for the safety sake.
Fixes: 33e4f80ee69b ("ACPI / PM: Ignore spurious SCI wakeups from suspend-to-idle")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/power/wakeup.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c index ee31d4f8d856..b30c45aad10f 100644 --- a/drivers/base/power/wakeup.c +++ b/drivers/base/power/wakeup.c @@ -859,7 +859,7 @@ EXPORT_SYMBOL_GPL(pm_system_wakeup); void pm_system_cancel_wakeup(void) { - atomic_dec(&pm_abort_suspend); + atomic_dec_if_positive(&pm_abort_suspend); } void pm_wakeup_clear(bool reset) |