mlx4_en: Fix a kernel panic when waking tx queue

[safe/jmp/linux-2.6] / drivers / acpi / processor_idle.c

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index e65476f..72069ba 100644 (file)
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -202,15 +202,38 @@ static void acpi_state_timer_broadcast(struct acpi_processor *pr,
  * Suspend / resume control
  */
 static int acpi_idle_suspend;
+static u32 saved_bm_rld;
+
+static void acpi_idle_bm_rld_save(void)
+{
+       acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
+}
+static void acpi_idle_bm_rld_restore(void)
+{
+       u32 resumed_bm_rld;
+
+       acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
+
+       if (resumed_bm_rld != saved_bm_rld)
+               acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
+}
 
 int acpi_processor_suspend(struct acpi_device * device, pm_message_t state)
 {
+       if (acpi_idle_suspend == 1)
+               return 0;
+
+       acpi_idle_bm_rld_save();
        acpi_idle_suspend = 1;
        return 0;
 }
 
 int acpi_processor_resume(struct acpi_device * device)
 {
+       if (acpi_idle_suspend == 0)
+               return 0;
+
+       acpi_idle_bm_rld_restore();
        acpi_idle_suspend = 0;
        return 0;
 }