linux-kernel - Re: [PATCH 2/3] xhci: Fix control transfer error on Etron xHCI host

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Message-ID: <14c33b7a-19a7-4639-aa4a-c5d259e32fe1@linux.intel.com>
Date: Wed, 11 Sep 2024 18:09:25 +0300
From: Mathias Nyman <mathias.nyman@...ux.intel.com>
To: Michał Pecio <michal.pecio@...il.com>,
 ki.chiang65@...il.com
Cc: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
 linux-usb@...r.kernel.org, mathias.nyman@...el.com, stable@...r.kernel.org
Subject: Re: [PATCH 2/3] xhci: Fix control transfer error on Etron xHCI host

> 4. How is it even possible? As far as I see, Linux simply queues
> three TRBs for a control URB. There are 255 slots in a segemnt,
> so exactly 85 URBs should fit, and then back to the first slot.

Not all control transfers have a Data stage TRB.

-Mathias