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Subject[PATCH 1/2] USB / Hub: Do not call device_set_wakeup_capable() under spinlock
Date
From: Rafael J. Wysocki <rjw@sisk.pl>

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 for that, modify
usb_set_device_state() to avoid calling device_set_wakeup_capable()
under device_state_lock.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/usb/core/hub.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
Index: linux-2.6/drivers/usb/core/hub.c
===================================================================
--- linux-2.6.orig/drivers/usb/core/hub.c
+++ linux-2.6/drivers/usb/core/hub.c
@@ -1465,6 +1465,7 @@ void usb_set_device_state(struct usb_dev
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_dev
|| 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_dev
} 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);



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