[SCSI] mpt2sas: Target Reset will be issued from Interrupt context.

(1) Added three new functions to handle sending target resest and OP_REMOVE
from interrupt time, they are _scsih_tm_tr_send, _scsih_tm_tr_complete, and
_scsih_sas_control_complete.  This code will create a link list of pending
target resets if there is no more available request in the hipriority
request queue.  The list is stored in ioc->delayed_tr_list.

(2) All callback handler return type is changed from void to u8.
Now _base_interrupt will check for return type of callback handlers to
take decision of message frame is already freed or not.
In genral,
Return 1 meaning mf should be freed from _base_interrupt
       0 means the mf is freed from function.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_transport.c b/drivers/scsi/mpt2sas/mpt2sas_transport.c
index 4b7201a1e867..8bc57e315ce8 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_transport.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_transport.c
@@ -218,9 +218,10 @@ _transport_set_identify(struct MPT2SAS_ADAPTER *ioc, u16 handle,
  * Callback handler when sending internal generated transport cmds.
  * The callback index passed is `ioc->transport_cb_idx`
  *
- * Return nothing.
+ * Return 1 meaning mf should be freed from _base_interrupt
+ *        0 means the mf is freed from this function.
  */
-void
+u8
 mpt2sas_transport_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
     u32 reply)
 {
@@ -228,9 +229,9 @@ mpt2sas_transport_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
 
         mpi_reply =  mpt2sas_base_get_reply_virt_addr(ioc, reply);
         if (ioc->transport_cmds.status == MPT2_CMD_NOT_USED)
-                return;
+                return 1;
         if (ioc->transport_cmds.smid != smid)
-                return;
+                return 1;
         ioc->transport_cmds.status |= MPT2_CMD_COMPLETE;
         if (mpi_reply) {
                 memcpy(ioc->transport_cmds.reply, mpi_reply,
@@ -239,6 +240,7 @@ mpt2sas_transport_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
         }
         ioc->transport_cmds.status &= ~MPT2_CMD_PENDING;
         complete(&ioc->transport_cmds.done);
+        return 1;
 }
 
 /* report manufacture request structure */