[SCSI] be2iscsi: Fix locking mechanism in Unsol Path

The default pdu is a common resource and needs to be protected
while manipulating it.

Signed-off-by: Minh Tran <minhduc.tran@emulex.com>
Signed-off-by: John Soni Jose <sony.john-n@emulex.com>
Signed-off-by: Jayamohan Kallickal <jayamohan.kallickal@emulex.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/scsi/be2iscsi/be_main.c b/drivers/scsi/be2iscsi/be_main.c
index 5ba575f0051b..991858262b72 100644
--- a/drivers/scsi/be2iscsi/be_main.c
+++ b/drivers/scsi/be2iscsi/be_main.c
@@ -2072,8 +2072,10 @@ static unsigned int beiscsi_process_cq(struct be_eq_obj *pbe_eq)
                                     "BM_%d : Received %s[%d] on CID : %d\n",
                                     cqe_desc[code], code, cid);
 
+                        spin_lock_bh(&phba->async_pdu_lock);
                         hwi_process_default_pdu_ring(beiscsi_conn, phba,
                                              (struct i_t_dpdu_cqe *)sol);
+                        spin_unlock_bh(&phba->async_pdu_lock);
                         break;
                 case UNSOL_DATA_NOTIFY:
                         beiscsi_log(phba, KERN_INFO,
@@ -2081,8 +2083,10 @@ static unsigned int beiscsi_process_cq(struct be_eq_obj *pbe_eq)
                                     "BM_%d : Received %s[%d] on CID : %d\n",
                                     cqe_desc[code], code, cid);
 
+                        spin_lock_bh(&phba->async_pdu_lock);
                         hwi_process_default_pdu_ring(beiscsi_conn, phba,
                                              (struct i_t_dpdu_cqe *)sol);
+                        spin_unlock_bh(&phba->async_pdu_lock);
                         break;
                 case CXN_INVALIDATE_INDEX_NOTIFY:
                 case CMD_INVALIDATED_NOTIFY:
@@ -2110,8 +2114,10 @@ static unsigned int beiscsi_process_cq(struct be_eq_obj *pbe_eq)
                                     BEISCSI_LOG_IO | BEISCSI_LOG_CONFIG,
                                     "BM_%d :  Dropping %s[%d] on DPDU ring on CID : %d\n",
                                     cqe_desc[code], code, cid);
+                        spin_lock_bh(&phba->async_pdu_lock);
                         hwi_flush_default_pdu_buffer(phba, beiscsi_conn,
                                              (struct i_t_dpdu_cqe *) sol);
+                        spin_unlock_bh(&phba->async_pdu_lock);
                         break;
                 case CXN_KILLED_PDU_SIZE_EXCEEDS_DSL:
                 case CXN_KILLED_BURST_LEN_MISMATCH:
@@ -5010,6 +5016,7 @@ static int beiscsi_dev_probe(struct pci_dev *pcidev,
         spin_lock_init(&phba->io_sgl_lock);
         spin_lock_init(&phba->mgmt_sgl_lock);
         spin_lock_init(&phba->isr_lock);
+        spin_lock_init(&phba->async_pdu_lock);
         ret = mgmt_get_fw_config(&phba->ctrl, phba);
         if (ret != 0) {
                 beiscsi_log(phba, KERN_ERR, BEISCSI_LOG_INIT,