This is a note to let you know that I've just added the patch titled
USB: core: Add hub_get() and hub_put() routines
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-core-add-hub_get-and-hub_put-routines.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ee113b860aa169e9a4d2c167c95d0f1961c6e1b8 Mon Sep 17 00:00:00 2001
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 15 Mar 2024 13:04:50 -0400
Subject: USB: core: Add hub_get() and hub_put() routines
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/604da420-ae8a-4a9e-91a4-2d511ff404fb@xxxxxxxxxxxxxxxxxxx
Cc: stable <stable@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -129,7 +129,6 @@ 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,
@@ -691,14 +690,14 @@ 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)
@@ -1066,7 +1065,7 @@ 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
@@ -1314,7 +1313,7 @@ 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 */
@@ -1730,6 +1729,16 @@ 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)
@@ -1778,7 +1787,7 @@ 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)
@@ -5905,7 +5914,7 @@ 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
@@ -129,6 +129,8 @@ 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,
Patches currently in stable-queue which might be from stern@xxxxxxxxxxxxxxxxxxx are
queue-6.8/usb-core-add-hub_get-and-hub_put-routines.patch
queue-6.8/usb-core-fix-deadlock-in-usb_deauthorize_interface.patch
queue-6.8/usb-core-fix-deadlock-in-port-disable-sysfs-attribute.patch
