WorkStruct: Pass the work_struct pointer instead of context data

Pass the work_struct pointer to the work function rather than context data.
The work function can use container_of() to work out the data.

For the cases where the container of the work_struct may go away the moment the
pending bit is cleared, it is made possible to defer the release of the
structure by deferring the clearing of the pending bit.

To make this work, an extra flag is introduced into the management side of the
work_struct.  This governs auto-release of the structure upon execution.

Ordinarily, the work queue executor would release the work_struct for further
scheduling or deallocation by clearing the pending bit prior to jumping to the
work function.  This means that, unless the driver makes some guarantee itself
that the work_struct won't go away, the work function may not access anything
else in the work_struct or its container lest they be deallocated..  This is a
problem if the auxiliary data is taken away (as done by the last patch).

However, if the pending bit is *not* cleared before jumping to the work
function, then the work function *may* access the work_struct and its container
with no problems.  But then the work function must itself release the
work_struct by calling work_release().

In most cases, automatic release is fine, so this is the default.  Special
initiators exist for the non-auto-release case (ending in _NAR).


Signed-Off-By: David Howells <dhowells@redhat.com>

2 files changed, 6 insertions, 6 deletions

diff --git a/drivers/input/keyboard/atkbd.c b/drivers/input/keyboard/atkbd.c
index cbb9366..8451b29 100644
--- a/drivers/input/keyboard/atkbd.c
+++ b/drivers/input/keyboard/atkbd.c
@@ -567,9 +567,9 @@ static int atkbd_set_leds(struct atkbd *atkbd)
  * interrupt context.
  */
 
-static void atkbd_event_work(void *data)
+static void atkbd_event_work(struct work_struct *work)
 {
-	struct atkbd *atkbd = data;
+	struct atkbd *atkbd = container_of(work, struct atkbd, event_work);
 
 	mutex_lock(&atkbd->event_mutex);
 
@@ -943,7 +943,7 @@ static int atkbd_connect(struct serio *serio, struct serio_driver *drv)
 
 	atkbd->dev = dev;
 	ps2_init(&atkbd->ps2dev, serio);
-	INIT_WORK(&atkbd->event_work, atkbd_event_work, atkbd);
+	INIT_WORK(&atkbd->event_work, atkbd_event_work);
 	mutex_init(&atkbd->event_mutex);
 
 	switch (serio->id.type) {
diff --git a/drivers/input/serio/libps2.c b/drivers/input/serio/libps2.c
index e5b1b60..b3e84d3 100644
--- a/drivers/input/serio/libps2.c
+++ b/drivers/input/serio/libps2.c
@@ -251,9 +251,9 @@ EXPORT_SYMBOL(ps2_command);
  * ps2_schedule_command(), to a PS/2 device (keyboard, mouse, etc.)
  */
 
-static void ps2_execute_scheduled_command(void *data)
+static void ps2_execute_scheduled_command(struct work_struct *work)
 {
-	struct ps2work *ps2work = data;
+	struct ps2work *ps2work = container_of(work, struct ps2work, work);
 
 	ps2_command(ps2work->ps2dev, ps2work->param, ps2work->command);
 	kfree(ps2work);
@@ -278,7 +278,7 @@ int ps2_schedule_command(struct ps2dev *ps2dev, unsigned char *param, int comman
 	ps2work->ps2dev = ps2dev;
 	ps2work->command = command;
 	memcpy(ps2work->param, param, send);
-	INIT_WORK(&ps2work->work, ps2_execute_scheduled_command, ps2work);
+	INIT_WORK(&ps2work->work, ps2_execute_scheduled_command);
 
 	if (!schedule_work(&ps2work->work)) {
 		kfree(ps2work);