From 8c9862e512f59ae3f41f83c109be12f93e37bb2d Mon Sep 17 00:00:00 2001
From: Alan Stern <stern@rowland.harvard.edu>
Date: Wed, 11 Apr 2007 12:06:16 -0400
Subject: [PATCH] USB: fix signed jiffies issue in autosuspend logic
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 <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/usb/core/driver.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 631f30582481..b9f7f90aef82 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -932,7 +932,7 @@ static int autosuspend_check(struct usb_device *udev)
{
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_device *udev)
/* 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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