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USB: fix char-device disconnect handling

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This patch (as1198) fixes a conceptual bug: Somewhere along the line
we managed to confuse USB class devices with USB char devices.  As a
result, the code to send a disconnect signal to userspace would not be
built if both CONFIG_USB_DEVICE_CLASS and CONFIG_USB_DEVICEFS were
disabled.

The usb_fs_classdev_common_remove() routine has been renamed to
usbdev_remove() and it is now called whenever any USB device is
removed, not just when a class device is unregistered.  The notifier
registration and unregistration calls are no longer conditionally
compiled.  And since the common removal code will always be called as
part of the char device interface, there's no need to call it again as
part of the usbfs interface; thus the invocation of
usb_fs_classdev_common_remove() has been taken out of
usbfs_remove_device().

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Alon Bar-Lev <alon.barlev@gmail.com>
Tested-by: Alon Bar-Lev <alon.barlev@gmail.com>
Cc: stable <stable@kernel.org>
This commit is contained in:
Alan Stern 2009-01-13 11:33:42 -05:00 committed by Greg Kroah-Hartman
parent a15d95a003
commit 501950d846
3 changed files with 12 additions and 10 deletions
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20
drivers/usb/core/devio.c
View File

@ -1700,7 +1700,7 @@ const struct file_operations usbdev_file_operations = {
.release = usbdev_release,
};
void usb_fs_classdev_common_remove(struct usb_device *udev)
static void usbdev_remove(struct usb_device *udev)
{
struct dev_state *ps;
struct siginfo sinfo;
@ -1742,10 +1742,15 @@ static void usb_classdev_remove(struct usb_device *dev)
{
if (dev->usb_classdev)
device_unregister(dev->usb_classdev);
usb_fs_classdev_common_remove(dev);
}
static int usb_classdev_notify(struct notifier_block *self,
#else
#define usb_classdev_add(dev) 0
#define usb_classdev_remove(dev) do {} while (0)
#endif
static int usbdev_notify(struct notifier_block *self,
unsigned long action, void *dev)
{
switch (action) {
@ -1755,15 +1760,15 @@ static int usb_classdev_notify(struct notifier_block *self,
break;
case USB_DEVICE_REMOVE:
usb_classdev_remove(dev);
usbdev_remove(dev);
break;
}
return NOTIFY_OK;
}
static struct notifier_block usbdev_nb = {
.notifier_call = usb_classdev_notify,
.notifier_call = usbdev_notify,
};
#endif
static struct cdev usb_device_cdev;
@ -1798,9 +1803,8 @@ int __init usb_devio_init(void)
* to /sys/dev
*/
usb_classdev_class->dev_kobj = NULL;
usb_register_notify(&usbdev_nb);
#endif
usb_register_notify(&usbdev_nb);
out:
return retval;
@ -1811,8 +1815,8 @@ error_cdev:
void usb_devio_cleanup(void)
{
#ifdef CONFIG_USB_DEVICE_CLASS
usb_unregister_notify(&usbdev_nb);
#ifdef CONFIG_USB_DEVICE_CLASS
class_destroy(usb_classdev_class);
#endif
cdev_del(&usb_device_cdev);

1
drivers/usb/core/inode.c
View File

@ -717,7 +717,6 @@ static void usbfs_remove_device(struct usb_device *dev)
fs_remove_file (dev->usbfs_dentry);
dev->usbfs_dentry = NULL;
}
usb_fs_classdev_common_remove(dev);
}
static int usbfs_notify(struct notifier_block *self, unsigned long action, void *dev)

1
drivers/usb/core/usb.h
View File

@ -152,7 +152,6 @@ extern struct usb_driver usbfs_driver;
extern const struct file_operations usbfs_devices_fops;
extern const struct file_operations usbdev_file_operations;
extern void usbfs_conn_disc_event(void);
extern void usb_fs_classdev_common_remove(struct usb_device *udev);
extern int usb_devio_init(void);
extern void usb_devio_cleanup(void);