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USB / Hub: Do not call device_set_wakeup_capable() under spinlock 

A subsequent patch will modify device_set_wakeup_capable() in such
a way that it will call functions which may sleep and therefore it
shouldn't be called under spinlocks.  In preparation to that, modify
usb_set_device_state() to avoid calling device_set_wakeup_capable()
under device_state_lock.

Tested-by: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Rafael J. Wysocki 2011-02-08 23:25:48 +01:00
parent 0295a34d61
commit 4681b17154
1 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/usb/core/hub.c
View File

@ -1465,6 +1465,7 @@ void usb_set_device_state(struct usb_device *udev,
enum usb_device_state new_state)
{
unsigned long flags;
int wakeup = -1;
spin_lock_irqsave(&device_state_lock, flags);
if (udev->state == USB_STATE_NOTATTACHED)
@ -1479,11 +1480,10 @@ void usb_set_device_state(struct usb_device *udev,
|| new_state == USB_STATE_SUSPENDED)
; /* No change to wakeup settings */
else if (new_state == USB_STATE_CONFIGURED)
device_set_wakeup_capable(&udev->dev,
(udev->actconfig->desc.bmAttributes
& USB_CONFIG_ATT_WAKEUP));
wakeup = udev->actconfig->desc.bmAttributes
& USB_CONFIG_ATT_WAKEUP;
else
device_set_wakeup_capable(&udev->dev, 0);
wakeup = 0;
}
if (udev->state == USB_STATE_SUSPENDED &&
new_state != USB_STATE_SUSPENDED)
@ -1495,6 +1495,8 @@ void usb_set_device_state(struct usb_device *udev,
} else
recursively_mark_NOTATTACHED(udev);
spin_unlock_irqrestore(&device_state_lock, flags);
if (wakeup >= 0)
device_set_wakeup_capable(&udev->dev, wakeup);
}
EXPORT_SYMBOL_GPL(usb_set_device_state);