Skip to content

Commit

Permalink
USB: fix autosuspend when CONFIG_PM isn't set
Browse files Browse the repository at this point in the history 
This patch (as791b) fixes things up to avoid compiler warnings or
errors when CONFIG_USB_SUSPEND or CONFIG_PM isn't set.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  • Loading branch information
Alan Stern authored and Greg Kroah-Hartman committed Sep 28, 2006
1 parent 8d1a243 commit e0318eb
Show file tree
Hide file tree
Showing 5 changed files with 43 additions and 27 deletions.
42 changes: 21 additions & 21 deletions drivers/usb/core/driver.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -303,11 +303,11 @@ int usb_driver_claim_interface(struct usb_driver *driver,
dev->driver = &driver->drvwrap.driver;
usb_set_intfdata(iface, priv);

mutex_lock_nested(&udev->pm_mutex, udev->level);
usb_pm_lock(udev);
iface->condition = USB_INTERFACE_BOUND;
mark_active(iface);
iface->pm_usage_cnt = !(driver->supports_autosuspend);
mutex_unlock(&udev->pm_mutex);
usb_pm_unlock(udev);

/* if interface was already added, bind now; else let
* the future device_add() bind it, bypassing probe()
Expand Down Expand Up @@ -356,11 +356,11 @@ void usb_driver_release_interface(struct usb_driver *driver,
dev->driver = NULL;
usb_set_intfdata(iface, NULL);

mutex_lock_nested(&udev->pm_mutex, udev->level);
usb_pm_lock(udev);
iface->condition = USB_INTERFACE_UNBOUND;
mark_quiesced(iface);
iface->needs_remote_wakeup = 0;
mutex_unlock(&udev->pm_mutex);
usb_pm_unlock(udev);
}
EXPORT_SYMBOL(usb_driver_release_interface);

Expand Down Expand Up @@ -789,7 +789,7 @@ EXPORT_SYMBOL_GPL_FUTURE(usb_deregister);

#ifdef CONFIG_PM

/* Caller has locked udev->pm_mutex */
/* Caller has locked udev's pm_mutex */
static int suspend_device(struct usb_device *udev, pm_message_t msg)
{
struct usb_device_driver *udriver;
Expand All @@ -816,7 +816,7 @@ static int suspend_device(struct usb_device *udev, pm_message_t msg)
return status;
}

/* Caller has locked udev->pm_mutex */
/* Caller has locked udev's pm_mutex */
static int resume_device(struct usb_device *udev)
{
struct usb_device_driver *udriver;
Expand All @@ -842,7 +842,7 @@ static int resume_device(struct usb_device *udev)
return status;
}

/* Caller has locked intf's usb_device's pm_mutex */
/* Caller has locked intf's usb_device's pm mutex */
static int suspend_interface(struct usb_interface *intf, pm_message_t msg)
{
struct usb_driver *driver;
Expand Down Expand Up @@ -1064,7 +1064,7 @@ int usb_resume_both(struct usb_device *udev)
/* Propagate the resume up the tree, if necessary */
if (udev->state == USB_STATE_SUSPENDED) {
if (parent) {
mutex_lock_nested(&parent->pm_mutex, parent->level);
usb_pm_lock(parent);
parent->auto_pm = 1;
status = usb_resume_both(parent);
} else {
Expand All @@ -1079,7 +1079,7 @@ int usb_resume_both(struct usb_device *udev)
if (status == 0)
status = resume_device(udev);
if (parent)
mutex_unlock(&parent->pm_mutex);
usb_pm_unlock(parent);
} else {

/* Needed only for setting udev->dev.power.power_state.event
Expand Down Expand Up @@ -1129,12 +1129,12 @@ int usb_resume_both(struct usb_device *udev)
*/
void usb_autosuspend_device(struct usb_device *udev, int dec_usage_cnt)
{
mutex_lock_nested(&udev->pm_mutex, udev->level);
usb_pm_lock(udev);
udev->pm_usage_cnt -= dec_usage_cnt;
if (udev->pm_usage_cnt <= 0)
queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
USB_AUTOSUSPEND_DELAY);
mutex_unlock(&udev->pm_mutex);
usb_pm_unlock(udev);
// dev_dbg(&udev->dev, "%s: cnt %d\n",
// __FUNCTION__, udev->pm_usage_cnt);
}
Expand Down Expand Up @@ -1168,13 +1168,13 @@ int usb_autoresume_device(struct usb_device *udev, int inc_usage_cnt)
{
int status;

mutex_lock_nested(&udev->pm_mutex, udev->level);
usb_pm_lock(udev);
udev->pm_usage_cnt += inc_usage_cnt;
udev->auto_pm = 1;
status = usb_resume_both(udev);
if (status != 0)
udev->pm_usage_cnt -= inc_usage_cnt;
mutex_unlock(&udev->pm_mutex);
usb_pm_unlock(udev);
// dev_dbg(&udev->dev, "%s: status %d cnt %d\n",
// __FUNCTION__, status, udev->pm_usage_cnt);
return status;
Expand Down Expand Up @@ -1215,13 +1215,13 @@ void usb_autopm_put_interface(struct usb_interface *intf)
{
struct usb_device *udev = interface_to_usbdev(intf);

mutex_lock_nested(&udev->pm_mutex, udev->level);
usb_pm_lock(udev);
if (intf->condition != USB_INTERFACE_UNBOUND &&
--intf->pm_usage_cnt <= 0) {
queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
USB_AUTOSUSPEND_DELAY);
}
mutex_unlock(&udev->pm_mutex);
usb_pm_unlock(udev);
// dev_dbg(&intf->dev, "%s: cnt %d\n",
// __FUNCTION__, intf->pm_usage_cnt);
}
Expand Down Expand Up @@ -1263,7 +1263,7 @@ int usb_autopm_get_interface(struct usb_interface *intf)
struct usb_device *udev = interface_to_usbdev(intf);
int status;

mutex_lock_nested(&udev->pm_mutex, udev->level);
usb_pm_lock(udev);
if (intf->condition == USB_INTERFACE_UNBOUND)
status = -ENODEV;
else {
Expand All @@ -1273,7 +1273,7 @@ int usb_autopm_get_interface(struct usb_interface *intf)
if (status != 0)
--intf->pm_usage_cnt;
}
mutex_unlock(&udev->pm_mutex);
usb_pm_unlock(udev);
// dev_dbg(&intf->dev, "%s: status %d cnt %d\n",
// __FUNCTION__, status, intf->pm_usage_cnt);
return status;
Expand All @@ -1289,10 +1289,10 @@ static int usb_suspend(struct device *dev, pm_message_t message)
if (is_usb_device(dev)) {
struct usb_device *udev = to_usb_device(dev);

mutex_lock_nested(&udev->pm_mutex, udev->level);
usb_pm_lock(udev);
udev->auto_pm = 0;
status = usb_suspend_both(udev, message);
mutex_unlock(&udev->pm_mutex);
usb_pm_unlock(udev);
} else
status = 0;
return status;
Expand All @@ -1305,10 +1305,10 @@ static int usb_resume(struct device *dev)
if (is_usb_device(dev)) {
struct usb_device *udev = to_usb_device(dev);

mutex_lock_nested(&udev->pm_mutex, udev->level);
usb_pm_lock(udev);
udev->auto_pm = 0;
status = usb_resume_both(udev);
mutex_unlock(&udev->pm_mutex);
usb_pm_unlock(udev);

/* Rebind drivers that had no suspend method? */
} else
Expand Down
4 changes: 2 additions & 2 deletions drivers/usb/core/hub.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1779,7 +1779,7 @@ static int remote_wakeup(struct usb_device *udev)
* to the parent hub! */

usb_lock_device(udev);
mutex_lock_nested(&udev->pm_mutex, udev->level);
usb_pm_lock(udev);
if (udev->state == USB_STATE_SUSPENDED) {
dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
/* TRSMRCY = 10 msec */
Expand All @@ -1788,7 +1788,7 @@ static int remote_wakeup(struct usb_device *udev)
if (status == 0)
udev->dev.power.power_state.event = PM_EVENT_ON;
}
mutex_unlock(&udev->pm_mutex);
usb_pm_unlock(udev);

if (status == 0)
usb_autoresume_device(udev, 0);
Expand Down
4 changes: 2 additions & 2 deletions drivers/usb/core/usb.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -214,10 +214,10 @@ static void usb_autosuspend_work(void *_udev)
{
struct usb_device *udev = _udev;

mutex_lock_nested(&udev->pm_mutex, udev->level);
usb_pm_lock(udev);
udev->auto_pm = 1;
usb_suspend_both(udev, PMSG_SUSPEND);
mutex_unlock(&udev->pm_mutex);
usb_pm_unlock(udev);
}

#else
Expand Down
18 changes: 17 additions & 1 deletion drivers/usb/core/usb.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,16 @@ extern int usb_resume_both(struct usb_device *udev);
extern int usb_port_suspend(struct usb_device *dev);
extern int usb_port_resume(struct usb_device *dev);

static inline void usb_pm_lock(struct usb_device *udev)
{
mutex_lock_nested(&udev->pm_mutex, udev->level);
}

static inline void usb_pm_unlock(struct usb_device *udev)
{
mutex_unlock(&udev->pm_mutex);
}

#else

#define usb_suspend_both(udev, msg) 0
Expand All @@ -45,6 +55,8 @@ static inline int usb_resume_both(struct usb_device *udev)
}
#define usb_port_suspend(dev) 0
#define usb_port_resume(dev) 0
static inline void usb_pm_lock(struct usb_device *udev) {}
static inline void usb_pm_unlock(struct usb_device *udev) {}

#endif

Expand All @@ -58,7 +70,11 @@ extern int usb_autoresume_device(struct usb_device *udev, int inc_busy_cnt);
#else

#define usb_autosuspend_device(udev, dec_busy_cnt) do {} while (0)
#define usb_autoresume_device(udev, inc_busy_cnt) 0
static inline int usb_autoresume_device(struct usb_device *udev,
int inc_busy_cnt)
{
return 0;
}

#endif

Expand Down
2 changes: 1 addition & 1 deletion include/linux/usb.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -380,10 +380,10 @@ struct usb_device {
int maxchild; /* Number of ports if hub */
struct usb_device *children[USB_MAXCHILDREN];

int pm_usage_cnt; /* usage counter for autosuspend */
#ifdef CONFIG_PM
struct work_struct autosuspend; /* for delayed autosuspends */
struct mutex pm_mutex; /* protects PM operations */
int pm_usage_cnt; /* usage counter for autosuspend */

unsigned auto_pm:1; /* autosuspend/resume in progress */
unsigned do_remote_wakeup:1; /* remote wakeup should be enabled */
Expand Down

0 comments on commit e0318eb

Please sign in to comment.