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Message-ID: <A53C580E-C0CC-42AA-B50B-F1B8A5756C9F@live.com>
Date: Sat, 6 Jul 2024 10:00:19 +0000
From: Aditya Garg <gargaditya08@...e.com>
To: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"oneukum@...e.com" <oneukum@...e.com>, "stern@...land.harvard.edu"
<stern@...land.harvard.edu>
CC: Kerem Karabay <kekrby@...il.com>, Orlando Chamberlain
<orlandoch.dev@...il.com>, Linux Kernel Mailing List
<linux-kernel@...r.kernel.org>, "linux-usb@...r.kernel.org"
<linux-usb@...r.kernel.org>, "linux-scsi@...r.kernel.org"
<linux-scsi@...r.kernel.org>, "usb-storage@...ts.one-eyed-alien.net"
<usb-storage@...ts.one-eyed-alien.net>
Subject: [PATCH v2 1/2] USB: core: add 'shutdown' callback to usb_driver
From: Kerem Karabay <kekrby@...il.com>
Currently there is no standardized method for USB drivers to handle
shutdown events. This patch simplifies running code on shutdown for USB
devices by adding a shutdown callback to usb_driver.
Signed-off-by: Kerem Karabay <kekrby@...il.com>
Signed-off-by: Aditya Garg <gargaditya08@...e.com>
---
drivers/usb/core/driver.c | 14 ++++++++++++++
include/linux/usb.h | 3 +++
2 files changed, 17 insertions(+)
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index e02ba15f6..b35734d03 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -517,6 +517,19 @@ static int usb_unbind_interface(struct device *dev)
return 0;
}
+static void usb_shutdown_interface(struct device *dev)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_driver *driver;
+
+ if (!dev->driver)
+ return;
+
+ driver = to_usb_driver(dev->driver);
+ if (driver->shutdown)
+ driver->shutdown(intf);
+}
+
/**
* usb_driver_claim_interface - bind a driver to an interface
* @driver: the driver to be bound
@@ -1059,6 +1072,7 @@ int usb_register_driver(struct usb_driver *new_driver, struct module *owner,
new_driver->driver.bus = &usb_bus_type;
new_driver->driver.probe = usb_probe_interface;
new_driver->driver.remove = usb_unbind_interface;
+ new_driver->driver.shutdown = usb_shutdown_interface;
new_driver->driver.owner = owner;
new_driver->driver.mod_name = mod_name;
new_driver->driver.dev_groups = new_driver->dev_groups;
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 1913a1383..832997a9d 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -1171,6 +1171,7 @@ extern ssize_t usb_show_dynids(struct usb_dynids *dynids, char *buf);
* post_reset method is called.
* @post_reset: Called by usb_reset_device() after the device
* has been reset
+ * @shutdown: Called at shut-down time to quiesce the device.
* @id_table: USB drivers use ID table to support hotplugging.
* Export this with MODULE_DEVICE_TABLE(usb,...). This must be set
* or your driver's probe function will never get called.
@@ -1222,6 +1223,8 @@ struct usb_driver {
int (*pre_reset)(struct usb_interface *intf);
int (*post_reset)(struct usb_interface *intf);
+ void (*shutdown)(struct usb_interface *intf);
+
const struct usb_device_id *id_table;
const struct attribute_group **dev_groups;
--
2.43.0
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