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USB: prevent autosuspend during hub initialization
This patch (as1153) fixes a potential problem in hub initialization. Starting in 2.6.28, initialization was split into several tasks to help speed up booting. This opens the possibility that the hub may be autosuspended before all the initialization tasks can complete. Normally that wouldn't matter, but with incomplete initialization there is a risk that the hub would never autoresume -- especially if devices were plugged into the hub beforehand. The solution is a simple one-line change to suppress autosuspend until the initialization is finished. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -659,6 +659,9 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
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PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2);
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schedule_delayed_work(&hub->init_work,
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msecs_to_jiffies(delay));
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/* Suppress autosuspend until init is done */
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to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
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return; /* Continues at init2: below */
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} else {
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hub_power_on(hub, true);
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