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>
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 0bb4b4d..b5f2da6 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -914,7 +914,7 @@
* ata_port_queue_task - Queue port_task
* @ap: The ata_port to queue port_task for
* @fn: workqueue function to be scheduled
- * @data: data value to pass to workqueue function
+ * @data: data for @fn to use
* @delay: delay time for workqueue function
*
* Schedule @fn(@data) for execution after @delay jiffies using
@@ -929,7 +929,7 @@
* LOCKING:
* Inherited from caller.
*/
-void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
+void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
unsigned long delay)
{
int rc;
@@ -937,7 +937,8 @@
if (ap->pflags & ATA_PFLAG_FLUSH_PORT_TASK)
return;
- PREPARE_DELAYED_WORK(&ap->port_task, fn, data);
+ PREPARE_DELAYED_WORK(&ap->port_task, fn);
+ ap->port_task_data = data;
rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
@@ -4292,10 +4293,11 @@
return poll_next;
}
-static void ata_pio_task(void *_data)
+static void ata_pio_task(struct work_struct *work)
{
- struct ata_queued_cmd *qc = _data;
- struct ata_port *ap = qc->ap;
+ struct ata_port *ap =
+ container_of(work, struct ata_port, port_task.work);
+ struct ata_queued_cmd *qc = ap->port_task_data;
u8 status;
int poll_next;
@@ -5317,9 +5319,9 @@
ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
#endif
- INIT_DELAYED_WORK(&ap->port_task, NULL, NULL);
- INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug, ap);
- INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan, ap);
+ INIT_DELAYED_WORK(&ap->port_task, NULL);
+ INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
+ INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
INIT_LIST_HEAD(&ap->eh_done_q);
init_waitqueue_head(&ap->eh_wait_q);
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 5c1fc46..c872b32 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3079,7 +3079,7 @@
/**
* ata_scsi_hotplug - SCSI part of hotplug
- * @data: Pointer to ATA port to perform SCSI hotplug on
+ * @work: Pointer to ATA port to perform SCSI hotplug on
*
* Perform SCSI part of hotplug. It's executed from a separate
* workqueue after EH completes. This is necessary because SCSI
@@ -3089,9 +3089,10 @@
* LOCKING:
* Kernel thread context (may sleep).
*/
-void ata_scsi_hotplug(void *data)
+void ata_scsi_hotplug(struct work_struct *work)
{
- struct ata_port *ap = data;
+ struct ata_port *ap =
+ container_of(work, struct ata_port, hotplug_task.work);
int i;
if (ap->pflags & ATA_PFLAG_UNLOADING) {
@@ -3190,7 +3191,7 @@
/**
* ata_scsi_dev_rescan - initiate scsi_rescan_device()
- * @data: Pointer to ATA port to perform scsi_rescan_device()
+ * @work: Pointer to ATA port to perform scsi_rescan_device()
*
* After ATA pass thru (SAT) commands are executed successfully,
* libata need to propagate the changes to SCSI layer. This
@@ -3200,9 +3201,10 @@
* LOCKING:
* Kernel thread context (may sleep).
*/
-void ata_scsi_dev_rescan(void *data)
+void ata_scsi_dev_rescan(struct work_struct *work)
{
- struct ata_port *ap = data;
+ struct ata_port *ap =
+ container_of(work, struct ata_port, scsi_rescan_task);
struct ata_device *dev;
unsigned int i;
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 0ed263b..7e0f3af 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -81,7 +81,7 @@
extern void ata_scsi_scan_host(struct ata_port *ap);
extern int ata_scsi_offline_dev(struct ata_device *dev);
-extern void ata_scsi_hotplug(void *data);
+extern void ata_scsi_hotplug(struct work_struct *work);
extern unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
unsigned int buflen);
@@ -111,7 +111,7 @@
unsigned int (*actor) (struct ata_scsi_args *args,
u8 *rbuf, unsigned int buflen));
extern void ata_schedule_scsi_eh(struct Scsi_Host *shost);
-extern void ata_scsi_dev_rescan(void *data);
+extern void ata_scsi_dev_rescan(struct work_struct *work);
extern int ata_bus_probe(struct ata_port *ap);
/* libata-eh.c */
