[SCSI] lpfc: Fix for "command completion for iotax x?? not found"

From: James Smart <James.Smart@emulex.com>

There were scenarios where the error handlers could reuse an iotag
value of an active io.  Remove all possibility of this by
pre-assigning iotag resources to command resources.

Signed-off-by: James Smart <James.Smart@emulex.com>

Rejections fixed up and
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/scsi/lpfc/lpfc_sli.h b/drivers/scsi/lpfc/lpfc_sli.h
index 2d5b0670415c..5d8911de4faa 100644
--- a/drivers/scsi/lpfc/lpfc_sli.h
+++ b/drivers/scsi/lpfc/lpfc_sli.h
@@ -33,6 +33,9 @@ typedef enum _lpfc_ctx_cmd {
 struct lpfc_iocbq {
         /* lpfc_iocbqs are used in double linked lists */
         struct list_head list;
+        uint16_t iotag;         /* pre-assigned IO tag */
+        uint16_t rsvd1;
+
         IOCB_t iocb;            /* IOCB cmd */
         uint8_t retry;          /* retry counter for IOCB cmd - if needed */
         uint8_t iocb_flag;
@@ -200,6 +203,11 @@ struct lpfc_sli {
                                            cmd */
 
         uint32_t *MBhostaddr;   /* virtual address for mbox cmds */
+
+#define LPFC_IOCBQ_LOOKUP_INCREMENT  1024
+        struct lpfc_iocbq ** iocbq_lookup; /* array to lookup IOCB by IOTAG */
+        size_t iocbq_lookup_len;           /* current lengs of the array */
+        uint16_t  last_iotag;              /* last allocated IOTAG */
 };
 
 /* Given a pointer to the start of the ring, and the slot number of