[158/200] USB: unbind all interfaces before rebinding them
diff mbox series

Message ID 20100701174259.867041442@clark.site
State New, archived
Headers show
  • stable review
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Commit Message

Greg KH July 1, 2010, 5:44 p.m. UTC
2.6.34-stable review patch.  If anyone has any objections, please let me know.


From: Alan Stern <stern@rowland.harvard.edu>

commit c043f1245654a726925529007210e9f786426448 upstream.

This patch (as1387) fixes a bug introduced during the changeover to
the runtime PM framework.  When a driver doesn't support resume or
reset-resume, and consequently its interfaces need to be unbound and
rebound, we have to unbind all the interfaces before trying to rebind
any of them.  Otherwise the driver's probe method for one interface
could try to claim a different interface and fail, because that other
interface hasn't been unbound yet.

This fixes Bugzilla #15788.  The symptom is that some USB sound cards
don't work after hibernation.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Fran├žois Valenduc <francois.valenduc@tvcablenet.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

 drivers/usb/core/driver.c |    2 ++
 1 file changed, 2 insertions(+)

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diff mbox series

--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -1322,6 +1322,7 @@  int usb_resume(struct device *dev, pm_me
 	/* For all other calls, take the device back to full power and
 	 * tell the PM core in case it was autosuspended previously.
+	 * Unbind the interfaces that will need rebinding later.
 	} else {
 		status = usb_resume_both(udev, msg);
@@ -1330,6 +1331,7 @@  int usb_resume(struct device *dev, pm_me
 			udev->last_busy = jiffies;
+			do_unbind_rebind(udev, DO_REBIND);