[SCSI] libfc: avoid exchanges collision during lport reset

Currently timer delay is large and is using msleep to avoid
avoid exchanges collision across lport reset, so instead
do this by initializing exches pool indexes during
reset also.

Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Tested-by: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Signed-off-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
(cherry picked from commit b6e3c84034b93e6acc895711f74730e235dfe9d2)

Signed-off-by: Joe Jin <joe.jin@oracle.com>

diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c
index 3b8a6451ea283ec5093307a774f32d92e7d90878..3670719e0ce2ffdd50a6ca6c69a0d6c5eadc4130 100644 (file)
--- a/drivers/scsi/libfc/fc_exch.c
+++ b/drivers/scsi/libfc/fc_exch.c
@@ -1754,6 +1754,9 @@ restart:
                        goto restart;
                }
        }
+       pool->next_index = 0;
+       pool->left = FC_XID_UNKNOWN;
+       pool->right = FC_XID_UNKNOWN;
        spin_unlock_bh(&pool->lock);
 }
 
@@ -2238,6 +2241,7 @@ struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport,
                goto free_mempool;
        for_each_possible_cpu(cpu) {
                pool = per_cpu_ptr(mp->pool, cpu);
+               pool->next_index = 0;
                pool->left = FC_XID_UNKNOWN;
                pool->right = FC_XID_UNKNOWN;
                spin_lock_init(&pool->lock);