[SCSI] lpfc 8.2.7 : Rework the worker thread

Rework of the worker thread to make it more efficient.
Make a finer-grain notfication of pending work so less time is
spent checking conditions. Also made other general cleanups.

Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 16 insertions, 4 deletions

diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
index ec0b0f6e5e1a..e3e5b540e36c 100644
--- a/drivers/scsi/lpfc/lpfc.h
+++ b/drivers/scsi/lpfc/lpfc.h
@@ -59,6 +59,9 @@ struct lpfc_sli2_slim;
 
 #define MAX_HBAEVT      32
 
+/* lpfc wait event data ready flag */
+#define LPFC_DATA_READY         (1<<0)
+
 enum lpfc_polling_flags {
         ENABLE_FCP_RING_POLLING = 0x1,
         DISABLE_FCP_RING_INT    = 0x2
@@ -425,9 +428,6 @@ struct lpfc_hba {
 
         uint16_t pci_cfg_value;
 
-        uint8_t work_found;
-#define LPFC_MAX_WORKER_ITERATION  4
-
         uint8_t fc_linkspeed;   /* Link speed after last READ_LA */
 
         uint32_t fc_eventTag;   /* event tag for link attention */
@@ -489,8 +489,9 @@ struct lpfc_hba {
         uint32_t              work_hs;      /* HS stored in case of ERRAT */
         uint32_t              work_status[2]; /* Extra status from SLIM */
 
-        wait_queue_head_t    *work_wait;
+        wait_queue_head_t    work_waitq;
         struct task_struct   *worker_thread;
+        long data_flags;
 
         uint32_t hbq_in_use;            /* HBQs in use flag */
         struct list_head hbqbuf_in_list;  /* in-fly hbq buffer list */
@@ -637,6 +638,17 @@ lpfc_is_link_up(struct lpfc_hba *phba)
                 phba->link_state == LPFC_HBA_READY;
 }
 
+static inline void
+lpfc_worker_wake_up(struct lpfc_hba *phba)
+{
+        /* Set the lpfc data pending flag */
+        set_bit(LPFC_DATA_READY, &phba->data_flags);
+
+        /* Wake up worker thread */
+        wake_up(&phba->work_waitq);
+        return;
+}
+
 #define FC_REG_DUMP_EVENT               0x10    /* Register for Dump events */
 #define FC_REG_TEMPERATURE_EVENT        0x20    /* Register for temperature
                                                    event */