linux-kernel - Re: [PATCH v2 5/7] usb: bdc: driver runs out of buffer descriptors on large ADB transfers

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Message-ID: <1cf26dfc-977c-59d2-2401-6e55fd513f1b@gmail.com>
Date:   Tue, 21 Jul 2020 10:34:06 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Al Cooper <alcooperx@...il.com>, linux-kernel@...r.kernel.org
Cc:     devicetree@...r.kernel.org, Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Sasi Kumar <sasi.kumar@...adcom.com>
Subject: Re: [PATCH v2 5/7] usb: bdc: driver runs out of buffer descriptors on
 large ADB transfers

On 7/21/20 7:43 AM, Al Cooper wrote:
> Version v1.0.40 of the Android host ADB software increased maximum
> transfer sizes from 256K to 1M. Since the STB ADB gadget driver
> requests only 16K at a time, the BDC driver ran out of buffer
> descriptors (BDs) if the queuing happens faster than the incoming
> 16K transfers. This issue is fixed by doubling the number of BDs
> that can be queued so that the entire 1M request can be queued
> without running out of buffers.
> 
> Signed-off-by: Al Cooper <alcooperx@...il.com>

Acked-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian