scsi: cxlflash: Mark expected switch fall-throughs

Mark switch cases where we are expecting to fall through.

This patch fixes the following warnings:

drivers/scsi/cxlflash/main.c: In function 'send_afu_cmd':
drivers/scsi/cxlflash/main.c:2347:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if (rc) {
      ^
drivers/scsi/cxlflash/main.c:2357:2: note: here
  case -EAGAIN:
  ^~~~
drivers/scsi/cxlflash/main.c: In function 'term_intr':
drivers/scsi/cxlflash/main.c:754:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if (index == PRIMARY_HWQ)
      ^
drivers/scsi/cxlflash/main.c:756:2: note: here
  case UNMAP_TWO:
  ^~~~
drivers/scsi/cxlflash/main.c:757:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   cfg->ops->unmap_afu_irq(hwq->ctx_cookie, 2, hwq);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/scsi/cxlflash/main.c:758:2: note: here
  case UNMAP_ONE:
  ^~~~
drivers/scsi/cxlflash/main.c:759:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   cfg->ops->unmap_afu_irq(hwq->ctx_cookie, 1, hwq);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/scsi/cxlflash/main.c:760:2: note: here
  case FREE_IRQ:
  ^~~~
drivers/scsi/cxlflash/main.c: In function 'cxlflash_remove':
drivers/scsi/cxlflash/main.c:975:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   cxlflash_release_chrdev(cfg);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/scsi/cxlflash/main.c:976:2: note: here
  case INIT_STATE_SCSI:
  ^~~~
drivers/scsi/cxlflash/main.c:978:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   scsi_remove_host(cfg->host);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/scsi/cxlflash/main.c:979:2: note: here
  case INIT_STATE_AFU:
  ^~~~
drivers/scsi/cxlflash/main.c:980:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   term_afu(cfg);
   ^~~~~~~~~~~~~
drivers/scsi/cxlflash/main.c:981:2: note: here
  case INIT_STATE_PCI:
  ^~~~
drivers/scsi/cxlflash/main.c:983:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   pci_disable_device(pdev);
   ^~~~~~~~~~~~~~~~~~~~~~~~
drivers/scsi/cxlflash/main.c:984:2: note: here
  case INIT_STATE_NONE:
  ^~~~
drivers/scsi/cxlflash/main.c: In function 'num_hwqs_store':
drivers/scsi/cxlflash/main.c:3018:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if (cfg->state == STATE_NORMAL)
      ^
drivers/scsi/cxlflash/main.c:3020:2: note: here
  default:
  ^~~~~~~
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Matthew R. Ochs <mrochs@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/cxlflash/main.c

@@ -753,10 +753,13 @@ static void term_intr(struct cxlflash_cfg *cfg, enum undo_level level,
 		/* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */
 		if (index == PRIMARY_HWQ)
 			cfg->ops->unmap_afu_irq(hwq->ctx_cookie, 3, hwq);
+		/* fall through */
 	case UNMAP_TWO:
 		cfg->ops->unmap_afu_irq(hwq->ctx_cookie, 2, hwq);
+		/* fall through */
 	case UNMAP_ONE:
 		cfg->ops->unmap_afu_irq(hwq->ctx_cookie, 1, hwq);
+		/* fall through */
 	case FREE_IRQ:
 		cfg->ops->free_afu_irqs(hwq->ctx_cookie);
 		/* fall through */
@@ -973,14 +976,18 @@ static void cxlflash_remove(struct pci_dev *pdev)
 	switch (cfg->init_state) {
 	case INIT_STATE_CDEV:
 		cxlflash_release_chrdev(cfg);
+		/* fall through */
 	case INIT_STATE_SCSI:
 		cxlflash_term_local_luns(cfg);
 		scsi_remove_host(cfg->host);
+		/* fall through */
 	case INIT_STATE_AFU:
 		term_afu(cfg);
+		/* fall through */
 	case INIT_STATE_PCI:
 		cfg->ops->destroy_afu(cfg->afu_cookie);
 		pci_disable_device(pdev);
+		/* fall through */
 	case INIT_STATE_NONE:
 		free_mem(cfg);
 		scsi_host_put(cfg->host);
@@ -2353,11 +2360,11 @@ static int send_afu_cmd(struct afu *afu, struct sisl_ioarcb *rcb)
 			cxlflash_schedule_async_reset(cfg);
 			break;
 		}
-		/* fall through to retry */
+		/* fall through - to retry */
 	case -EAGAIN:
 		if (++nretry < 2)
 			goto retry;
-		/* fall through to exit */
+		/* fall through - to exit */
 	default:
 		break;
 	}
@@ -3017,6 +3024,7 @@ static ssize_t num_hwqs_store(struct device *dev,
 		wait_event(cfg->reset_waitq, cfg->state != STATE_RESET);
 		if (cfg->state == STATE_NORMAL)
 			goto retry;
+		/* else, fall through */
 	default:
 		/* Ideally should not happen */
 		dev_err(dev, "%s: Device is not ready, state=%d\n",