Re: [PATCH] usb: musb: Fix potential NULL dereference

From: Bin Liu
Date: Fri Jan 25 2019 - 11:44:16 EST

On Thu, Jan 24, 2019 at 09:47:02PM +0300, Matwey V. Kornilov wrote:
> By the way, why do we need to store the qh in urb->hcpriv?
> qh can always be accessible through urb->ep->hcpriv
> Wouldn't it be better to drop entire urb->hcpriv usage?

I am not sure why. The code is there since the first commit in a decade
ago. But I tend to agree with you.

In a quick search for urb->hcpriv and urb->ep->hcpriv, based on the
usage in core/hcd.c, it seems to me that urb->hcpriv should not be
changed in each controller driver, but I see both have been used in most
controller drivers. I will leave this to others to educate me.