USB: fix race in autosuspend reschedule

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This patch (as1002) fixes a small race which can occur when a driver
expects usbcore to reschedule an autosuspend request.  If the request
arrives too late, it won't be rescheduled.  The patch adds an extra
argument to autosuspend_check(), indicating that a reschedule is
needed no matter how much time has elapsed.

It also tries to avoid letting asynchronous changes to the value of
jiffies cause a delay to become negative, by caching a local copy of
the current time.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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Alan Stern 2007-10-11 16:47:36 -04:00 • committed by Greg Kroah-Hartman

parent 58ed7b94d9

commit d1aa3e6aa8

1 changed files with 16 additions and 16 deletions

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32

drivers/usb/core/driver.c

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