This patch (as897) changes the autosuspend timer code to use the
standard types and macros in dealing with jiffies values.
Signed-off-by: Alan Stern <[EMAIL PROTECTED]>
---
On Tue, 10 Apr 2007, Greg KH wrote:
> Ok, care to make a patch that clarifies this? Also I really think the
> signed usage is wrong and will not properly handle the jiffies wrap
> around issue as the code is today.
Here it is. This should answer all your objections.
Alan Stern
Index: usb-2.6/drivers/usb/core/driver.c
===================================================================
--- usb-2.6.orig/drivers/usb/core/driver.c
+++ usb-2.6/drivers/usb/core/driver.c
@@ -932,7 +932,7 @@ static int autosuspend_check(struct usb_
{
int i;
struct usb_interface *intf;
- long suspend_time;
+ unsigned long suspend_time;
/* For autosuspend, fail fast if anything is in use or autosuspend
* is disabled. Also fail if any interfaces require remote wakeup
@@ -964,11 +964,18 @@ static int autosuspend_check(struct usb_
/* If everything is okay but the device hasn't been idle for long
* enough, queue a delayed autosuspend request.
*/
- suspend_time -= jiffies;
- if (suspend_time > 0) {
- if (!timer_pending(&udev->autosuspend.timer))
+ if (time_after(suspend_time, jiffies)) {
+ if (!timer_pending(&udev->autosuspend.timer)) {
+
+ /* The value of jiffies may change between the
+ * time_after() comparison above and the subtraction
+ * below. That's okay; the system behaves sanely
+ * when a timer is registered for the present moment
+ * or for the past.
+ */
queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
- suspend_time);
+ suspend_time - jiffies);
+ }
return -EAGAIN;
}
return 0;
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