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>
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 0f299b7..19d3435 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1465,6 +1465,7 @@
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 @@
|| 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 @@
} 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);