From: Alan Stern <[EMAIL PROTECTED]>
This patch (as741) makes the non-hub parts of usbcore actually use the
autosuspend facilities added by an earlier patch.
Devices opened through usbfs are autoresumed and then
autosuspended upon close.
Likewise for usb-skeleton.
Devices are autoresumed for usb_set_configuration.
Signed-off-by: Alan Stern <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
drivers/usb/core/devio.c | 11 ++++++++---
drivers/usb/core/generic.c | 7 ++-----
drivers/usb/core/message.c | 10 +++++++---
drivers/usb/usb-skeleton.c | 11 +++++++++++
4 files changed, 28 insertions(+), 11 deletions(-)
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 43c0872..fd345ad 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -558,10 +558,12 @@ static int usbdev_open(struct inode *ino
dev = usbdev_lookup_minor(iminor(inode));
if (!dev)
dev = inode->i_private;
- if (!dev) {
- kfree(ps);
+ if (!dev)
goto out;
- }
+ ret = usb_autoresume_device(dev, 1);
+ if (ret)
+ goto out;
+
usb_get_dev(dev);
ret = 0;
ps->dev = dev;
@@ -581,6 +583,8 @@ static int usbdev_open(struct inode *ino
list_add_tail(&ps->list, &dev->filelist);
file->private_data = ps;
out:
+ if (ret)
+ kfree(ps);
mutex_unlock(&usbfs_mutex);
return ret;
}
@@ -604,6 +608,7 @@ static int usbdev_release(struct inode *
releaseintf(ps, ifnum);
}
destroy_all_async(ps);
+ usb_autosuspend_device(dev, 1);
usb_unlock_device(dev);
usb_put_dev(dev);
kfree(ps);
diff --git a/drivers/usb/core/generic.c b/drivers/usb/core/generic.c
index 5358e65..16332cc 100644
--- a/drivers/usb/core/generic.c
+++ b/drivers/usb/core/generic.c
@@ -172,14 +172,10 @@ static void generic_disconnect(struct us
/* if this is only an unbind, not a physical disconnect, then
* unconfigure the device */
- if (udev->state == USB_STATE_CONFIGURED)
+ if (udev->actconfig)
usb_set_configuration(udev, 0);
usb_remove_sysfs_dev_files(udev);
-
- /* in case the call failed or the device was suspended */
- if (udev->state >= USB_STATE_CONFIGURED)
- usb_disable_device(udev, 0);
}
#ifdef CONFIG_PM
@@ -208,4 +204,5 @@ #ifdef CONFIG_PM
.suspend = generic_suspend,
.resume = generic_resume,
#endif
+ .supports_autosuspend = 1,
};
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 1580c81..28c6cf2 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1366,9 +1366,6 @@ int usb_set_configuration(struct usb_dev
if (cp && configuration == 0)
dev_warn(&dev->dev, "config 0 descriptor??\n");
- if (dev->state == USB_STATE_SUSPENDED)
- return -EHOSTUNREACH;
-
/* Allocate memory for new interfaces before doing anything else,
* so that if we run out then nothing will have changed. */
n = nintf = 0;
@@ -1403,6 +1400,11 @@ free_interfaces:
configuration, -i);
}
+ /* Wake up the device so we can send it the Set-Config request */
+ ret = usb_autoresume_device(dev, 1);
+ if (ret)
+ goto free_interfaces;
+
/* if it's already configured, clear out old state first.
* getting rid of old interfaces means unbinding their drivers.
*/
@@ -1422,6 +1424,7 @@ free_interfaces:
dev->actconfig = cp;
if (!cp) {
usb_set_device_state(dev, USB_STATE_ADDRESS);
+ usb_autosuspend_device(dev, 1);
goto free_interfaces;
}
usb_set_device_state(dev, USB_STATE_CONFIGURED);
@@ -1490,6 +1493,7 @@ free_interfaces:
usb_create_sysfs_intf_files (intf);
}
+ usb_autosuspend_device(dev, 1);
return 0;
}
diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c
index 9b542a6..1b51d31 100644
--- a/drivers/usb/usb-skeleton.c
+++ b/drivers/usb/usb-skeleton.c
@@ -90,6 +90,11 @@ static int skel_open(struct inode *inode
goto exit;
}
+ /* prevent the device from being autosuspended */
+ retval = usb_autopm_get_interface(interface);
+ if (retval)
+ goto exit;
+
/* increment our usage count for the device */
kref_get(&dev->kref);
@@ -108,6 +113,12 @@ static int skel_release(struct inode *in
if (dev == NULL)
return -ENODEV;
+ /* allow the device to be autosuspended */
+ mutex_lock(&dev->io_mutex);
+ if (dev->interface)
+ usb_autopm_put_interface(dev->interface);
+ mutex_unlock(&dev->io_mutex);
+
/* decrement the count on our device */
kref_put(&dev->kref, skel_delete);
return 0;
--
1.4.2.1
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