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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-05-15 23:29:57 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-05-16 12:18:27 +0200
commit1f0b63866fc1be700260547be8edf8e6f0af37f2 (patch)
tree19834a42634cdc86a0addca25d1f71cbf408b273 /drivers/acpi/sleep.c
parentfad16dd9c962229c5965ec6f5cd5f48180f94fd4 (diff)
ACPI / PM: Hold ACPI scan lock over the "freeze" sleep state
The "freeze" sleep state suffers from the same issue that was addressed by commit ad07277e82de (ACPI / PM: Hold acpi_scan_lock over system PM transitions) for ACPI sleep states, that is, things break if ->remove() is called for devices whose system resume callbacks haven't been executed yet. It also can be addressed in the same way, by holding the ACPI scan lock over the "freeze" sleep state and PM transitions to and from that state, but ->begin() and ->end() platform operations for the "freeze" sleep state are needed for this purpose. This change has been tested on Acer Aspire S5 with Thunderbolt. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/sleep.c')
-rw-r--r--drivers/acpi/sleep.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 2281ca31c1bc..c11e3795431b 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -612,6 +612,22 @@ static const struct platform_suspend_ops acpi_suspend_ops_old = {
.recover = acpi_pm_finish,
};
+static int acpi_freeze_begin(void)
+{
+ acpi_scan_lock_acquire();
+ return 0;
+}
+
+static void acpi_freeze_end(void)
+{
+ acpi_scan_lock_release();
+}
+
+static const struct platform_freeze_ops acpi_freeze_ops = {
+ .begin = acpi_freeze_begin,
+ .end = acpi_freeze_end,
+};
+
static void acpi_sleep_suspend_setup(void)
{
int i;
@@ -622,7 +638,9 @@ static void acpi_sleep_suspend_setup(void)
suspend_set_ops(old_suspend_ordering ?
&acpi_suspend_ops_old : &acpi_suspend_ops);
+ freeze_set_ops(&acpi_freeze_ops);
}
+
#else /* !CONFIG_SUSPEND */
static inline void acpi_sleep_suspend_setup(void) {}
#endif /* !CONFIG_SUSPEND */