Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "Six fixes, all of which appear to have user visible consequences.

  The DMA one is a regression fix from the merge window and of the
  others, four are driver specific and one specific to the target code"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: ufs: Use explicit access size in ufshcd_dump_regs
  scsi: tcmu: fix use after free
  scsi: csiostor: fix NULL pointer dereference in csio_vport_set_state()
  scsi: lpfc: nvmet: avoid hang / use-after-free when destroying targetport
  scsi: lpfc: nvme: avoid hang / use-after-free when destroying localport
  scsi: communicate max segment size to the DMA mapping code

4 files changed, 16 insertions, 12 deletions

diff --git a/drivers/scsi/lpfc/lpfc_nvme.c b/drivers/scsi/lpfc/lpfc_nvme.c
index 4c66b19e6199..8c9f79042228 100644
--- a/drivers/scsi/lpfc/lpfc_nvme.c
+++ b/drivers/scsi/lpfc/lpfc_nvme.c
@@ -297,7 +297,8 @@ lpfc_nvme_localport_delete(struct nvme_fc_local_port *localport)
 			 lport);
 
 	/* release any threads waiting for the unreg to complete */
-	complete(&lport->lport_unreg_done);
+	if (lport->vport->localport)
+		complete(lport->lport_unreg_cmp);
 }
 
 /* lpfc_nvme_remoteport_delete
@@ -2545,7 +2546,8 @@ lpfc_nvme_create_localport(struct lpfc_vport *vport)
  */
 void
 lpfc_nvme_lport_unreg_wait(struct lpfc_vport *vport,
-			   struct lpfc_nvme_lport *lport)
+			   struct lpfc_nvme_lport *lport,
+			   struct completion *lport_unreg_cmp)
 {
 #if (IS_ENABLED(CONFIG_NVME_FC))
 	u32 wait_tmo;
@@ -2557,8 +2559,7 @@ lpfc_nvme_lport_unreg_wait(struct lpfc_vport *vport,
 	 */
 	wait_tmo = msecs_to_jiffies(LPFC_NVME_WAIT_TMO * 1000);
 	while (true) {
-		ret = wait_for_completion_timeout(&lport->lport_unreg_done,
-						  wait_tmo);
+		ret = wait_for_completion_timeout(lport_unreg_cmp, wait_tmo);
 		if (unlikely(!ret)) {
 			lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_IOERR,
 					 "6176 Lport %p Localport %p wait "
@@ -2592,12 +2593,12 @@ lpfc_nvme_destroy_localport(struct lpfc_vport *vport)
 	struct lpfc_nvme_lport *lport;
 	struct lpfc_nvme_ctrl_stat *cstat;
 	int ret;
+	DECLARE_COMPLETION_ONSTACK(lport_unreg_cmp);
 
 	if (vport->nvmei_support == 0)
 		return;
 
 	localport = vport->localport;
-	vport->localport = NULL;
 	lport = (struct lpfc_nvme_lport *)localport->private;
 	cstat = lport->cstat;
 
@@ -2608,13 +2609,14 @@ lpfc_nvme_destroy_localport(struct lpfc_vport *vport)
 	/* lport's rport list is clear.  Unregister
 	 * lport and release resources.
 	 */
-	init_completion(&lport->lport_unreg_done);
+	lport->lport_unreg_cmp = &lport_unreg_cmp;
 	ret = nvme_fc_unregister_localport(localport);
 
 	/* Wait for completion.  This either blocks
 	 * indefinitely or succeeds
 	 */
-	lpfc_nvme_lport_unreg_wait(vport, lport);
+	lpfc_nvme_lport_unreg_wait(vport, lport, &lport_unreg_cmp);
+	vport->localport = NULL;
 	kfree(cstat);
 
 	/* Regardless of the unregister upcall response, clear
diff --git a/drivers/scsi/lpfc/lpfc_nvme.h b/drivers/scsi/lpfc/lpfc_nvme.h
index cfd4719be25c..b234d0298994 100644
--- a/drivers/scsi/lpfc/lpfc_nvme.h
+++ b/drivers/scsi/lpfc/lpfc_nvme.h
@@ -50,7 +50,7 @@ struct lpfc_nvme_ctrl_stat {
 /* Declare nvme-based local and remote port definitions. */
 struct lpfc_nvme_lport {
 	struct lpfc_vport *vport;
-	struct completion lport_unreg_done;
+	struct completion *lport_unreg_cmp;
 	/* Add stats counters here */
 	struct lpfc_nvme_ctrl_stat *cstat;
 	atomic_t fc4NvmeLsRequests;
diff --git a/drivers/scsi/lpfc/lpfc_nvmet.c b/drivers/scsi/lpfc/lpfc_nvmet.c
index 6245f442d784..95fee83090eb 100644
--- a/drivers/scsi/lpfc/lpfc_nvmet.c
+++ b/drivers/scsi/lpfc/lpfc_nvmet.c
@@ -1003,7 +1003,8 @@ lpfc_nvmet_targetport_delete(struct nvmet_fc_target_port *targetport)
 	struct lpfc_nvmet_tgtport *tport = targetport->private;
 
 	/* release any threads waiting for the unreg to complete */
-	complete(&tport->tport_unreg_done);
+	if (tport->phba->targetport)
+		complete(tport->tport_unreg_cmp);
 }
 
 static void
@@ -1692,6 +1693,7 @@ lpfc_nvmet_destroy_targetport(struct lpfc_hba *phba)
 	struct lpfc_nvmet_tgtport *tgtp;
 	struct lpfc_queue *wq;
 	uint32_t qidx;
+	DECLARE_COMPLETION_ONSTACK(tport_unreg_cmp);
 
 	if (phba->nvmet_support == 0)
 		return;
@@ -1701,9 +1703,9 @@ lpfc_nvmet_destroy_targetport(struct lpfc_hba *phba)
 			wq = phba->sli4_hba.nvme_wq[qidx];
 			lpfc_nvmet_wqfull_flush(phba, wq, NULL);
 		}
-		init_completion(&tgtp->tport_unreg_done);
+		tgtp->tport_unreg_cmp = &tport_unreg_cmp;
 		nvmet_fc_unregister_targetport(phba->targetport);
-		wait_for_completion_timeout(&tgtp->tport_unreg_done, 5);
+		wait_for_completion_timeout(&tport_unreg_cmp, 5);
 		lpfc_nvmet_cleanup_io_context(phba);
 	}
 	phba->targetport = NULL;
diff --git a/drivers/scsi/lpfc/lpfc_nvmet.h b/drivers/scsi/lpfc/lpfc_nvmet.h
index 1aaff63f1f41..0ec1082ce7ef 100644
--- a/drivers/scsi/lpfc/lpfc_nvmet.h
+++ b/drivers/scsi/lpfc/lpfc_nvmet.h
@@ -34,7 +34,7 @@
 /* Used for NVME Target */
 struct lpfc_nvmet_tgtport {
 	struct lpfc_hba *phba;
-	struct completion tport_unreg_done;
+	struct completion *tport_unreg_cmp;
 
 	/* Stats counters - lpfc_nvmet_unsol_ls_buffer */
 	atomic_t rcv_ls_req_in;