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Date: Tue, 21 Apr 2015 10:02:30 +0300 From: Roger Quadros <rogerq@...com> To: Alan Stern <stern@...land.harvard.edu> CC: Peter Chen <peter.chen@...escale.com>, <gregkh@...uxfoundation.org>, <balbi@...com>, <dan.j.williams@...el.com>, <jun.li@...escale.com>, <mathias.nyman@...ux.intel.com>, <tony@...mide.com>, <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org> Subject: Re: [RFC][PATCH v2 06/13] usb: hcd: Add hcd add/remove functions for OTG use On 20/04/15 16:56, Alan Stern wrote: > On Mon, 20 Apr 2015, Roger Quadros wrote: > >>> I don't understand this. Why do you want to defer the add/remove if >>> the device is OTG? Don't host controller drivers expect these things >>> to execute synchronously? >> >> Sorry for the wrong information. We actually defer only the add as the >> OTG state machine might not yet be in Host ready mode. >> The remove is always synchronous and we ensure that the HCD is removed >> when usb_otg_unregister_hcd() returns. > > That's okay then, but it does leave one potential hole. What happens > if usb_add_hcd() is deferred for so long that usb_remove_hcd() gets > called before the add can complete? We keep track of the HCD state in the OTG state machine and if it was not yet added then _usb_remove_hcd() is not called during usb_otg_unregister_hcd() in the usb_remove_hcd() call. cheers, -roger -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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