mei: stop the stall timer worker if not needed
The stall timer worker checks periodically if there is a stalled i/o
transaction. The issue with the current implementation is that the timer
is ticking also when there is no pending i/o transaction.
This patch provides a simple change that prevents rescheduling
of the delayed work when there is no pending i/o.
Cc: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
index 082462e..7ae89b4 100644
--- a/drivers/misc/mei/amthif.c
+++ b/drivers/misc/mei/amthif.c
@@ -277,6 +277,7 @@
case MEI_FOP_WRITE:
if (!cb->status) {
dev->iamthif_stall_timer = MEI_IAMTHIF_STALL_TIMER;
+ mei_schedule_stall_timer(dev);
mei_io_cb_free(cb);
return;
}
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index 45a7652..6fe0235 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -826,6 +826,7 @@
list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
cl->timer_count = MEI_CONNECT_TIMEOUT;
+ mei_schedule_stall_timer(dev);
return 0;
}
@@ -1011,6 +1012,7 @@
list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
cl->timer_count = MEI_CONNECT_TIMEOUT;
+ mei_schedule_stall_timer(dev);
return 0;
}
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index 4b9495f..dd7f15a 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -277,6 +277,7 @@
dev->hbm_state = MEI_HBM_STARTING;
dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+ mei_schedule_stall_timer(dev);
return 0;
}
@@ -312,6 +313,7 @@
}
dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+ mei_schedule_stall_timer(dev);
return 0;
}
@@ -562,6 +564,7 @@
}
dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+ mei_schedule_stall_timer(dev);
return 0;
}
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index f7c8dfd..9a9c248 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -94,7 +94,7 @@
cancel_work_sync(&dev->reset_work);
cancel_work_sync(&dev->bus_rescan_work);
- cancel_delayed_work(&dev->timer_work);
+ cancel_delayed_work_sync(&dev->timer_work);
}
EXPORT_SYMBOL_GPL(mei_cancel_work);
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index bf745e0..5a4893c 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -459,6 +459,19 @@
mei_reset(dev);
}
+#define MEI_STALL_TIMER_FREQ (2 * HZ)
+/**
+ * mei_schedule_stall_timer - re-arm stall_timer work
+ *
+ * Schedule stall timer
+ *
+ * @dev: the device structure
+ */
+void mei_schedule_stall_timer(struct mei_device *dev)
+{
+ schedule_delayed_work(&dev->timer_work, MEI_STALL_TIMER_FREQ);
+}
+
/**
* mei_timer - timer function.
*
@@ -468,10 +481,9 @@
void mei_timer(struct work_struct *work)
{
struct mei_cl *cl;
-
struct mei_device *dev = container_of(work,
struct mei_device, timer_work.work);
-
+ bool reschedule_timer = false;
mutex_lock(&dev->device_lock);
@@ -486,6 +498,7 @@
mei_reset(dev);
goto out;
}
+ reschedule_timer = true;
}
}
@@ -500,6 +513,7 @@
mei_connect_timeout(cl);
goto out;
}
+ reschedule_timer = true;
}
}
@@ -512,11 +526,14 @@
mei_reset(dev);
mei_amthif_run_next_cmd(dev);
+ goto out;
}
+ reschedule_timer = true;
}
out:
- if (dev->dev_state != MEI_DEV_DISABLED)
- schedule_delayed_work(&dev->timer_work, 2 * HZ);
+ if (dev->dev_state != MEI_DEV_DISABLED && reschedule_timer)
+ mei_schedule_stall_timer(dev);
+
mutex_unlock(&dev->device_lock);
}
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 397ae2b..1169fd9 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -548,6 +548,7 @@
*/
void mei_timer(struct work_struct *work);
+void mei_schedule_stall_timer(struct mei_device *dev);
int mei_irq_read_handler(struct mei_device *dev,
struct mei_cl_cb *cmpl_list, s32 *slots);
diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
index e85bb37..f3ffd88 100644
--- a/drivers/misc/mei/pci-me.c
+++ b/drivers/misc/mei/pci-me.c
@@ -220,8 +220,6 @@
pci_set_drvdata(pdev, dev);
- schedule_delayed_work(&dev->timer_work, HZ);
-
/*
* For not wake-able HW runtime pm framework
* can't be used on pci device level.
