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USB: unbind all interfaces before rebinding them
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: François Valenduc <francois.valenduc@tvcablenet.be> Cc: stable <stable@kernel.org> [.34] Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -1328,6 +1328,7 @@ int usb_resume(struct device *dev, pm_message_t msg)
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/* For all other calls, take the device back to full power and
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* tell the PM core in case it was autosuspended previously.
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* Unbind the interfaces that will need rebinding later.
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*/
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} else {
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status = usb_resume_both(udev, msg);
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@ -1336,6 +1337,7 @@ int usb_resume(struct device *dev, pm_message_t msg)
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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udev->last_busy = jiffies;
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do_unbind_rebind(udev, DO_REBIND);
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}
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}
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