From mboxrd@z Thu Jan 1 00:00:00 1970 From: arnd@arndb.de (Arnd Bergmann) Date: Thu, 28 Apr 2016 16:23:56 +0200 Subject: [PATCH] usb: dwc3: host: inherit dma configuration from parent dev In-Reply-To: <20160428141611.GK19428@n2100.arm.linux.org.uk> References: <87y47ykzmz.fsf@intel.com> <20160428141611.GK19428@n2100.arm.linux.org.uk> Message-ID: <2806018.GHhm6tEuKR@wuerfel> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thursday 28 April 2016 15:16:12 Russell King - ARM Linux wrote: > On Thu, Apr 28, 2016 at 09:37:08AM +0300, Felipe Balbi wrote: > > > > Hi, > > > > Arnd Bergmann writes: > > > pointer and pass that in platform_data. This is really easy, it's > > > > Sorry but passing a struct device pointer in platform_data is > > ridiculous. Not to mention that, as I said before, we can't assume which > > device to pass to xhci_plat in the first place. It might be dwc->dev and > > it might be dwc->dev->parent. > > +1. Passing an unref-counted struct device through platform data is > totally mad, Arnd you're off your rocker if you think that's a good > idea. What's more is that there's no way to properly refcount the > thing. It's the parent device (or NULL), there is no way it can ever go away as it's already refcounted through the device subsystem by the creation of the child device. I do realize that it's a hack, but the idea is to get rid of that as soon as possibly by fixing the way the xhci device is probe so we no longer need to fake a platform_device as the child here and can just use the device itself. Arnd