[PATCH 6.6 364/396] USB: core: Add hub_get() and hub_put() routines

Greg Kroah-Hartman
2024-04-01T16:54:37Z

From: Alan Stern <stern@rowland.harvard.edu>

commit ee113b860aa169e9a4d2c167c95d0f1961c6e1b8 upstream.

Create hub_get() and hub_put() routines to encapsulate the kref_get()
and kref_put() calls in hub.c. The new routines will be used by the
next patch in this series.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/604da420-ae8a-4a9e-91a4-2d511ff404fb@rowland.harvard.edu
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/usb/core/hub.c | 23 ++++++++++++++++-------
drivers/usb/core/hub.h | 2 ++
2 files changed, 18 insertions(+), 7 deletions(-)

--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -123,7 +123,6 @@ EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rws
#define HUB_DEBOUNCE_STEP 25
#define HUB_DEBOUNCE_STABLE 100

-static void hub_release(struct kref *kref);
static int usb_reset_and_verify_device(struct usb_device *udev);
static int hub_port_disable(struct usb_hub *hub, int port1, int set_state);
static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1,
@@ -685,14 +684,14 @@ static void kick_hub_wq(struct usb_hub *
*/
intf = to_usb_interface(hub->intfdev);
usb_autopm_get_interface_no_resume(intf);
- kref_get(&hub->kref);
+ hub_get(hub);

if (queue_work(hub_wq, &hub->events))
return;

/* the work has already been scheduled */
usb_autopm_put_interface_async(intf);
- kref_put(&hub->kref, hub_release);
+ hub_put(hub);
}

void usb_kick_hub_wq(struct usb_device *hdev)
@@ -1060,7 +1059,7 @@ static void hub_activate(struct usb_hub
goto init2;
goto init3;
}
- kref_get(&hub->kref);
+ hub_get(hub);

/* The superspeed hub except for root hub has to use Hub Depth
* value as an offset into the route string to locate the bits
@@ -1308,7 +1307,7 @@ static void hub_activate(struct usb_hub
device_unlock(&hdev->dev);
}

- kref_put(&hub->kref, hub_release);
+ hub_put(hub);
}

/* Implement the continuations for the delays above */
@@ -1724,6 +1723,16 @@ static void hub_release(struct kref *kre
kfree(hub);
}

+void hub_get(struct usb_hub *hub)
+{
+ kref_get(&hub->kref);
+}
+
+void hub_put(struct usb_hub *hub)
+{
+ kref_put(&hub->kref, hub_release);
+}
+
static unsigned highspeed_hubs;

static void hub_disconnect(struct usb_interface *intf)
@@ -1772,7 +1781,7 @@ static void hub_disconnect(struct usb_in

onboard_hub_destroy_pdevs(&hub->onboard_hub_devs);

- kref_put(&hub->kref, hub_release);
+ hub_put(hub);
}

static bool hub_descriptor_is_sane(struct usb_host_interface *desc)
@@ -5890,7 +5899,7 @@ out_hdev_lock:

/* Balance the stuff in kick_hub_wq() and allow autosuspend */
usb_autopm_put_interface(intf);
- kref_put(&hub->kref, hub_release);
+ hub_put(hub);

kcov_remote_stop();
}
--- a/drivers/usb/core/hub.h
+++ b/drivers/usb/core/hub.h
@@ -126,6 +126,8 @@ extern void usb_hub_remove_port_device(s
extern int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
int port1, bool set);
extern struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev);
+extern void hub_get(struct usb_hub *hub);
+extern void hub_put(struct usb_hub *hub);
extern int hub_port_debounce(struct usb_hub *hub, int port1,
bool must_be_connected);
extern int usb_clear_port_feature(struct usb_device *hdev,