Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] 
https://www.kernel.org/doc/html/latest/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <gustavo...@kernel.org>
---
 drivers/usb/host/ehci-dbg.c   |    2 +-
 drivers/usb/host/ehci-fsl.c   |    4 ++--
 drivers/usb/host/ehci-hcd.c   |    4 ++--
 drivers/usb/host/ehci-q.c     |    2 +-
 drivers/usb/host/ehci-sched.c |    2 +-
 5 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c
index 7619cfb06883..0b7f1edd9eec 100644
--- a/drivers/usb/host/ehci-dbg.c
+++ b/drivers/usb/host/ehci-dbg.c
@@ -823,7 +823,7 @@ static ssize_t fill_registers_buffer(struct debug_buffer 
*buf)
                                break;
                        case 0:         /* illegal reserved capability */
                                cap = 0;
-                               /* FALLTHROUGH */
+                               fallthrough;
                        default:                /* unknown */
                                break;
                        }
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index 9e9c232e896f..6c2b53baa515 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -234,7 +234,7 @@ static int ehci_fsl_setup_phy(struct usb_hcd *hcd,
                break;
        case FSL_USB2_PHY_UTMI_WIDE:
                portsc |= PORT_PTS_PTW;
-               /* fall through */
+               fallthrough;
        case FSL_USB2_PHY_UTMI:
                /* Presence of this node "has_fsl_erratum_a006918"
                 * in device-tree is used to stop USB controller
@@ -244,7 +244,7 @@ static int ehci_fsl_setup_phy(struct usb_hcd *hcd,
                        dev_warn(dev, "USB PHY clock invalid\n");
                        return -EINVAL;
                }
-               /* fall through */
+               fallthrough;
        case FSL_USB2_PHY_UTMI_DUAL:
                /* PHY_CLK_VALID bit is de-featured from all controller
                 * versions below 2.4 and is to be checked only for
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index cf2b7ae93b7e..6257be4110ca 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -982,7 +982,7 @@ ehci_endpoint_disable (struct usb_hcd *hcd, struct 
usb_host_endpoint *ep)
                        start_unlink_async(ehci, qh);
                else
                        start_unlink_intr(ehci, qh);
-               /* FALL THROUGH */
+               fallthrough;
        case QH_STATE_COMPLETING:       /* already in unlinking */
        case QH_STATE_UNLINK:           /* wait for hw to finish? */
        case QH_STATE_UNLINK_WAIT:
@@ -999,7 +999,7 @@ ehci_endpoint_disable (struct usb_hcd *hcd, struct 
usb_host_endpoint *ep)
                        qh_destroy(ehci, qh);
                        break;
                }
-               /* fall through */
+               fallthrough;
        default:
                /* caller was supposed to have unlinked any requests;
                 * that's not our job.  just leak this memory.
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 8a5c9b3ebe1e..a826715ae9bd 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -874,7 +874,7 @@ qh_make (
        switch (urb->dev->speed) {
        case USB_SPEED_LOW:
                info1 |= QH_LOW_SPEED;
-               /* FALL THROUGH */
+               fallthrough;
 
        case USB_SPEED_FULL:
                /* EPS 0 means "full" */
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index da7b00a6110b..847979f265b1 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -2475,7 +2475,7 @@ static void scan_isoc(struct ehci_hcd *ehci)
                        ehci_dbg(ehci, "corrupt type %d frame %d shadow %p\n",
                                        type, frame, q.ptr);
                        /* BUG(); */
-                       /* FALL THROUGH */
+                       fallthrough;
                case Q_TYPE_QH:
                case Q_TYPE_FSTN:
                        /* End of the iTDs and siTDs */

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