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>

1 files changed, 8 insertions, 6 deletions

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 5c1fc467fc7f..c872b324dbd3 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3079,7 +3079,7 @@ static void ata_scsi_remove_dev(struct ata_device *dev)
 
 /**
  *      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 @@ static void ata_scsi_remove_dev(struct ata_device *dev)
  *      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 @@ static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
 
 /**
  *      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 @@ static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
  *      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;