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https://github.com/torvalds/linux
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cd9f03759d
USB device files are accessible in two ways: as files in usbfs and as character device nodes. The two paths are supposed to behave identically, but they don't. When the underlying USB device is unplugged, disconnect signals are sent to processes with open usbfs files (if they requested these signals) but not to processes with open device node files. This patch (as1104) fixes the bug by moving the disconnect-signalling code into a common subroutine which is called from both paths. Putting this subroutine in devio.c removes the only out-of-file reference to struct dev_state, and so the structure's declaration can be moved from usb.h into devio.c. Finally, the new subroutine performs one extra action: It kills all the outstanding async URBs. (I'd kill the outstanding synchronous URBs too, if there was any way to do it.) In the past this hasn't mattered much, because devices were unregistered from usbfs only when they were disconnected. But now the unregistration can also occur whenever devices are unbound from the usb_generic driver. At any rate, killing URBs when a device is unregistered from usbfs seems like a good thing to do. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
156 lines
4.6 KiB
C
156 lines
4.6 KiB
C
/* Functions local to drivers/usb/core/ */
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extern int usb_create_sysfs_dev_files(struct usb_device *dev);
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extern void usb_remove_sysfs_dev_files(struct usb_device *dev);
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extern int usb_create_sysfs_intf_files(struct usb_interface *intf);
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extern void usb_remove_sysfs_intf_files(struct usb_interface *intf);
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extern int usb_create_ep_files(struct device *parent,
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struct usb_host_endpoint *endpoint,
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struct usb_device *udev);
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extern void usb_remove_ep_files(struct usb_host_endpoint *endpoint);
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extern void usb_enable_endpoint(struct usb_device *dev,
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struct usb_host_endpoint *ep);
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extern void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr);
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extern void usb_disable_interface(struct usb_device *dev,
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struct usb_interface *intf);
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extern void usb_release_interface_cache(struct kref *ref);
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extern void usb_disable_device(struct usb_device *dev, int skip_ep0);
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extern int usb_deauthorize_device(struct usb_device *);
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extern int usb_authorize_device(struct usb_device *);
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extern void usb_detect_quirks(struct usb_device *udev);
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extern int usb_get_device_descriptor(struct usb_device *dev,
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unsigned int size);
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extern char *usb_cache_string(struct usb_device *udev, int index);
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extern int usb_set_configuration(struct usb_device *dev, int configuration);
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extern int usb_choose_configuration(struct usb_device *udev);
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extern void usb_kick_khubd(struct usb_device *dev);
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extern int usb_match_device(struct usb_device *dev,
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const struct usb_device_id *id);
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extern void usb_forced_unbind_intf(struct usb_interface *intf);
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extern void usb_rebind_intf(struct usb_interface *intf);
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extern int usb_hub_init(void);
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extern void usb_hub_cleanup(void);
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extern int usb_major_init(void);
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extern void usb_major_cleanup(void);
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extern int usb_host_init(void);
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extern void usb_host_cleanup(void);
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#ifdef CONFIG_PM
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extern void usb_autosuspend_work(struct work_struct *work);
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extern int usb_port_suspend(struct usb_device *dev);
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extern int usb_port_resume(struct usb_device *dev);
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extern int usb_external_suspend_device(struct usb_device *udev,
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pm_message_t msg);
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extern int usb_external_resume_device(struct usb_device *udev);
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static inline void usb_pm_lock(struct usb_device *udev)
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{
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mutex_lock_nested(&udev->pm_mutex, udev->level);
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}
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static inline void usb_pm_unlock(struct usb_device *udev)
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{
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mutex_unlock(&udev->pm_mutex);
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}
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#else
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static inline int usb_port_suspend(struct usb_device *udev)
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{
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return 0;
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}
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static inline int usb_port_resume(struct usb_device *udev)
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{
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return 0;
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}
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static inline void usb_pm_lock(struct usb_device *udev) {}
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static inline void usb_pm_unlock(struct usb_device *udev) {}
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#endif
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#ifdef CONFIG_USB_SUSPEND
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extern void usb_autosuspend_device(struct usb_device *udev);
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extern void usb_try_autosuspend_device(struct usb_device *udev);
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extern int usb_autoresume_device(struct usb_device *udev);
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#else
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#define usb_autosuspend_device(udev) do {} while (0)
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#define usb_try_autosuspend_device(udev) do {} while (0)
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static inline int usb_autoresume_device(struct usb_device *udev)
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{
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return 0;
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}
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#endif
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extern struct workqueue_struct *ksuspend_usb_wq;
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extern struct bus_type usb_bus_type;
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extern struct device_type usb_device_type;
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extern struct device_type usb_if_device_type;
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extern struct usb_device_driver usb_generic_driver;
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static inline int is_usb_device(const struct device *dev)
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{
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return dev->type == &usb_device_type;
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}
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/* Do the same for device drivers and interface drivers. */
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static inline int is_usb_device_driver(struct device_driver *drv)
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{
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return container_of(drv, struct usbdrv_wrap, driver)->
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for_devices;
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}
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/* Interfaces and their "power state" are owned by usbcore */
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static inline void mark_active(struct usb_interface *f)
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{
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f->is_active = 1;
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}
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static inline void mark_quiesced(struct usb_interface *f)
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{
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f->is_active = 0;
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}
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static inline int is_active(const struct usb_interface *f)
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{
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return f->is_active;
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}
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/* for labeling diagnostics */
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extern const char *usbcore_name;
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/* sysfs stuff */
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extern struct attribute_group *usb_device_groups[];
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extern struct attribute_group *usb_interface_groups[];
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/* usbfs stuff */
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extern struct mutex usbfs_mutex;
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extern struct usb_driver usbfs_driver;
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extern const struct file_operations usbfs_devices_fops;
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extern const struct file_operations usbdev_file_operations;
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extern void usbfs_conn_disc_event(void);
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extern void usb_fs_classdev_common_remove(struct usb_device *udev);
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extern int usb_devio_init(void);
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extern void usb_devio_cleanup(void);
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/* internal notify stuff */
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extern void usb_notify_add_device(struct usb_device *udev);
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extern void usb_notify_remove_device(struct usb_device *udev);
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extern void usb_notify_add_bus(struct usb_bus *ubus);
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extern void usb_notify_remove_bus(struct usb_bus *ubus);
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