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USB: add reset_resume method

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This patch (as918) introduces a new USB driver method: reset_resume.
It is called when a device needs to be reset as part of a resume
procedure (whether because of a device quirk or because of the
USB-Persist facility), thereby taking over a role formerly assigned to
the post_reset method.  As a consequence, post_reset no longer needs
an argument indicating whether it is being called as part of a
reset-resume.  This separation of functions makes the code clearer.

In addition, the pre_reset and post_reset method return types are
changed; they now must return an error code.  The return value is
unused at present, but at some later time we may unbind drivers and
re-probe if they encounter an error during reset handling.

The existing pre_reset and post_reset methods in the usbhid,
usb-storage, and hub drivers are updated to match the new
requirements.  For usbhid the post_reset routine is also used for
reset_resume (duplicate method pointers); for the other drivers a new
reset_resume routine is added.  The change to hub.c looks bigger than
it really is, because mark_children_for_reset_resume() gets moved down
next to the new hub_reset_resume() routine.

A minor change to usb-storage makes the usb_stor_report_bus_reset()
routine acquire the host lock instead of requiring the caller to hold
it already.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
CC: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2007-05-30 15:38:16 -04:00 committed by Greg Kroah-Hartman
parent 624d6c0732
commit f07600cf9e
6 changed files with 140 additions and 80 deletions
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9
drivers/hid/usbhid/hid-core.c
View file

@ -1009,20 +1009,22 @@ static int hid_resume(struct usb_interface *intf)
}
/* Treat USB reset pretty much the same as suspend/resume */
static void hid_pre_reset(struct usb_interface *intf)
static int hid_pre_reset(struct usb_interface *intf)
{
/* FIXME: What if the interface is already suspended? */
hid_suspend(intf, PMSG_ON);
return 0;
}
static void hid_post_reset(struct usb_interface *intf, int reset_resume)
/* Same routine used for post_reset and reset_resume */
static int hid_post_reset(struct usb_interface *intf)
{
struct usb_device *dev = interface_to_usbdev (intf);
hid_set_idle(dev, intf->cur_altsetting->desc.bInterfaceNumber, 0, 0);
/* FIXME: Any more reinitialization needed? */
hid_resume(intf);
return hid_resume(intf);
}
static struct usb_device_id hid_usb_ids [] = {
@ -1039,6 +1041,7 @@ static struct usb_driver hid_driver = {
.disconnect = hid_disconnect,
.suspend = hid_suspend,
.resume = hid_resume,
.reset_resume = hid_post_reset,
.pre_reset = hid_pre_reset,
.post_reset = hid_post_reset,
.id_table = hid_usb_ids,

51
drivers/usb/core/driver.c
View file

@ -915,21 +915,37 @@ static int usb_resume_interface(struct usb_interface *intf, int reset_resume)
}
driver = to_usb_driver(intf->dev.driver);
if (reset_resume && driver->post_reset)
driver->post_reset(intf, reset_resume);
else if (driver->resume) {
status = driver->resume(intf);
if (status)
dev_err(&intf->dev, "%s error %d\n",
"resume", status);
} else
dev_warn(&intf->dev, "no resume for driver %s?\n",
driver->name);
if (reset_resume) {
if (driver->reset_resume) {
status = driver->reset_resume(intf);
if (status)
dev_err(&intf->dev, "%s error %d\n",
"reset_resume", status);
} else {
// status = -EOPNOTSUPP;
dev_warn(&intf->dev, "no %s for driver %s?\n",
"reset_resume", driver->name);
}
} else {
if (driver->resume) {
status = driver->resume(intf);
if (status)
dev_err(&intf->dev, "%s error %d\n",
"resume", status);
} else {
// status = -EOPNOTSUPP;
dev_warn(&intf->dev, "no %s for driver %s?\n",
"resume", driver->name);
}
}
done:
dev_vdbg(&intf->dev, "%s: status %d\n", __FUNCTION__, status);
if (status == 0)
mark_active(intf);
/* FIXME: Unbind the driver and reprobe if the resume failed
* (not possible if auto_pm is set) */
return status;
}
@ -966,6 +982,18 @@ static int autosuspend_check(struct usb_device *udev)
"for autosuspend\n");
return -EOPNOTSUPP;
}
/* Don't allow autosuspend if the device will need
* a reset-resume and any of its interface drivers
* doesn't include support.
*/
if (udev->quirks & USB_QUIRK_RESET_RESUME) {
struct usb_driver *driver;
driver = to_usb_driver(intf->dev.driver);
if (!driver->reset_resume)
return -EOPNOTSUPP;
}
}
}
@ -1146,7 +1174,8 @@ static int usb_resume_both(struct usb_device *udev)
status = usb_autoresume_device(parent);
if (status == 0) {
status = usb_resume_device(udev);
if (status) {
if (status || udev->state ==
USB_STATE_NOTATTACHED) {
usb_autosuspend_device(parent);
/* It's possible usb_resume_device()

117
drivers/usb/core/hub.c
View file

@ -605,73 +605,26 @@ static void disconnect_all_children(struct usb_hub *hub, int logical)
}
}
#ifdef CONFIG_USB_PERSIST
#define USB_PERSIST 1
/* For "persistent-device" resets we must mark the child devices for reset
* and turn off a possible connect-change status (so khubd won't disconnect
* them later).
*/
static void mark_children_for_reset_resume(struct usb_hub *hub)
{
struct usb_device *hdev = hub->hdev;
int port1;
for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
struct usb_device *child = hdev->children[port1-1];
if (child) {
child->reset_resume = 1;
clear_port_feature(hdev, port1,
USB_PORT_FEAT_C_CONNECTION);
}
}
}
#else
#define USB_PERSIST 0
static inline void mark_children_for_reset_resume(struct usb_hub *hub)
{ }
#endif /* CONFIG_USB_PERSIST */
/* caller has locked the hub device */
static void hub_pre_reset(struct usb_interface *intf)
static int hub_pre_reset(struct usb_interface *intf)
{
struct usb_hub *hub = usb_get_intfdata(intf);
/* This routine doesn't run as part of a reset-resume, so it's safe
* to disconnect all the drivers below the hub.
*/
disconnect_all_children(hub, 0);
hub_quiesce(hub);
return 0;
}
/* caller has locked the hub device */
static void hub_post_reset(struct usb_interface *intf, int reset_resume)
static int hub_post_reset(struct usb_interface *intf)
{
struct usb_hub *hub = usb_get_intfdata(intf);
hub_power_on(hub);
if (reset_resume) {
if (USB_PERSIST)
mark_children_for_reset_resume(hub);
else {
/* Reset-resume doesn't call pre_reset, so we have to
* disconnect the children here. But we may not lock
* the child devices, so we have to do a "logical"
* disconnect.
*/
disconnect_all_children(hub, 1);
}
}
hub_activate(hub);
return 0;
}
static int hub_configure(struct usb_hub *hub,
struct usb_endpoint_descriptor *endpoint)
{
@ -1931,6 +1884,58 @@ static int hub_resume(struct usb_interface *intf)
return 0;
}
#ifdef CONFIG_USB_PERSIST
#define USB_PERSIST 1
/* For "persistent-device" resets we must mark the child devices for reset
* and turn off a possible connect-change status (so khubd won't disconnect
* them later).
*/
static void mark_children_for_reset_resume(struct usb_hub *hub)
{
struct usb_device *hdev = hub->hdev;
int port1;
for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
struct usb_device *child = hdev->children[port1-1];
if (child) {
child->reset_resume = 1;
clear_port_feature(hdev, port1,
USB_PORT_FEAT_C_CONNECTION);
}
}
}
#else
#define USB_PERSIST 0
static inline void mark_children_for_reset_resume(struct usb_hub *hub)
{ }
#endif /* CONFIG_USB_PERSIST */
static int hub_reset_resume(struct usb_interface *intf)
{
struct usb_hub *hub = usb_get_intfdata(intf);
hub_power_on(hub);
if (USB_PERSIST)
mark_children_for_reset_resume(hub);
else {
/* Reset-resume doesn't call pre_reset, so we have to
* disconnect the children here. But we may not lock
* the child devices, so we have to do a "logical"
* disconnect.
*/
disconnect_all_children(hub, 1);
}
hub_activate(hub);
return 0;
}
#else /* CONFIG_PM */
static inline int remote_wakeup(struct usb_device *udev)
@ -1938,8 +1943,9 @@ static inline int remote_wakeup(struct usb_device *udev)
return 0;
}
#define hub_suspend NULL
#define hub_resume NULL
#define hub_suspend NULL
#define hub_resume NULL
#define hub_reset_resume NULL
#endif
@ -2768,6 +2774,7 @@ static struct usb_driver hub_driver = {
.disconnect = hub_disconnect,
.suspend = hub_suspend,
.resume = hub_resume,
.reset_resume = hub_reset_resume,
.pre_reset = hub_pre_reset,
.post_reset = hub_post_reset,
.ioctl = hub_ioctl,
@ -3021,6 +3028,7 @@ int usb_reset_composite_device(struct usb_device *udev,
drv = to_usb_driver(cintf->dev.driver);
if (drv->pre_reset)
(drv->pre_reset)(cintf);
/* FIXME: Unbind if pre_reset returns an error or isn't defined */
}
}
}
@ -3038,7 +3046,8 @@ int usb_reset_composite_device(struct usb_device *udev,
cintf->dev.driver) {
drv = to_usb_driver(cintf->dev.driver);
if (drv->post_reset)
(drv->post_reset)(cintf, 0);
(drv->post_reset)(cintf);
/* FIXME: Unbind if post_reset returns an error or isn't defined */
}
if (cintf != iface)
up(&cintf->dev.sem);

8
drivers/usb/storage/scsiglue.c
View file

@ -321,10 +321,14 @@ void usb_stor_report_device_reset(struct us_data *us)
/* Report a driver-initiated bus reset to the SCSI layer.
* Calling this for a SCSI-initiated reset is unnecessary but harmless.
* The caller must own the SCSI host lock. */
* The caller must not own the SCSI host lock. */
void usb_stor_report_bus_reset(struct us_data *us)
{
scsi_report_bus_reset(us_to_host(us), 0);
struct Scsi_Host *host = us_to_host(us);
scsi_lock(host);
scsi_report_bus_reset(host, 0);
scsi_unlock(host);
}
/***********************************************************************

28
drivers/usb/storage/usb.c
View file

@ -219,6 +219,20 @@ static int storage_resume(struct usb_interface *iface)
return 0;
}
static int storage_reset_resume(struct usb_interface *iface)
{
struct us_data *us = usb_get_intfdata(iface);
US_DEBUGP("%s\n", __FUNCTION__);
/* Report the reset to the SCSI core */
usb_stor_report_bus_reset(us);
/* FIXME: Notify the subdrivers that they need to reinitialize
* the device */
return 0;
}
#endif /* CONFIG_PM */
/*
@ -226,7 +240,7 @@ static int storage_resume(struct usb_interface *iface)
* a USB port reset, whether from this driver or a different one.
*/
static void storage_pre_reset(struct usb_interface *iface)
static int storage_pre_reset(struct usb_interface *iface)
{
struct us_data *us = usb_get_intfdata(iface);
@ -234,26 +248,23 @@ static void storage_pre_reset(struct usb_interface *iface)
/* Make sure no command runs during the reset */
mutex_lock(&us->dev_mutex);
return 0;
}
static void storage_post_reset(struct usb_interface *iface, int reset_resume)
static int storage_post_reset(struct usb_interface *iface)
{
struct us_data *us = usb_get_intfdata(iface);
US_DEBUGP("%s\n", __FUNCTION__);
/* Report the reset to the SCSI core */
scsi_lock(us_to_host(us));
usb_stor_report_bus_reset(us);
scsi_unlock(us_to_host(us));
/* FIXME: Notify the subdrivers that they need to reinitialize
* the device */
/* If this is a reset-resume then the pre_reset routine wasn't
* called, so we don't need to unlock the mutex. */
if (!reset_resume)
mutex_unlock(&us->dev_mutex);
mutex_unlock(&us->dev_mutex);
return 0;
}
/*
@ -1061,6 +1072,7 @@ static struct usb_driver usb_storage_driver = {
#ifdef CONFIG_PM
.suspend = storage_suspend,
.resume = storage_resume,
.reset_resume = storage_reset_resume,
#endif
.pre_reset = storage_pre_reset,
.post_reset = storage_post_reset,

7
include/linux/usb.h
View file

@ -839,6 +839,8 @@ struct usbdrv_wrap {
* do (or don't) show up otherwise in the filesystem.
* @suspend: Called when the device is going to be suspended by the system.
* @resume: Called when the device is being resumed by the system.
* @reset_resume: Called when the suspended device has been reset instead
* of being resumed.
* @pre_reset: Called by usb_reset_composite_device() when the device
* is about to be reset.
* @post_reset: Called by usb_reset_composite_device() after the device
@ -885,9 +887,10 @@ struct usb_driver {
int (*suspend) (struct usb_interface *intf, pm_message_t message);
int (*resume) (struct usb_interface *intf);
int (*reset_resume)(struct usb_interface *intf);
void (*pre_reset) (struct usb_interface *intf);
void (*post_reset) (struct usb_interface *intf, int reset_resume);
int (*pre_reset)(struct usb_interface *intf);
int (*post_reset)(struct usb_interface *intf);
const struct usb_device_id *id_table;