lpfc: Fix locking for postbufq when freeing

Fix locking for postbufq when freeing

Signed-off-by: James Smart <james.smart@emulex.com>
Reviewed-By: Dick Kennedy <dick.kennedy@emulex.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index b2671dd..512f91e 100644 (file)
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -836,19 +836,28 @@ lpfc_hba_free_post_buf(struct lpfc_hba *phba)
        struct lpfc_sli *psli = &phba->sli;
        struct lpfc_sli_ring *pring;
        struct lpfc_dmabuf *mp, *next_mp;
+       LIST_HEAD(buflist);
+       int count;
 
        if (phba->sli3_options & LPFC_SLI3_HBQ_ENABLED)
                lpfc_sli_hbqbuf_free_all(phba);
        else {
                /* Cleanup preposted buffers on the ELS ring */
-               spin_lock_irq(&phba->hbalock);
                pring = &psli->ring[LPFC_ELS_RING];
-               list_for_each_entry_safe(mp, next_mp, &pring->postbufq, list) {
+               spin_lock_irq(&phba->hbalock);
+               list_splice_init(&pring->postbufq, &buflist);
+               spin_unlock_irq(&phba->hbalock);
+
+               count = 0;
+               list_for_each_entry_safe(mp, next_mp, &buflist, list) {
                        list_del(&mp->list);
-                       pring->postbufq_cnt--;
+                       count++;
                        lpfc_mbuf_free(phba, mp->virt, mp->phys);
                        kfree(mp);
                }
+
+               spin_lock_irq(&phba->hbalock);
+               pring->postbufq_cnt -= count;
                spin_unlock_irq(&phba->hbalock);
        }
 }