linux-kernel - Re: [PATCH v3] usbip: Don't submit special requests twice

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Message-ID: <834f187e-a469-4457-b4fa-6a6eb0419ea8@linuxfoundation.org>
Date:   Mon, 4 Dec 2023 11:19:21 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Simon Holesch <simon@...esch.de>,
        Valentina Manea <valentina.manea.m@...il.com>,
        Shuah Khan <shuah@...nel.org>, Hongren Zheng <i@...ithal.me>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v3] usbip: Don't submit special requests twice

On 11/30/23 16:10, Simon Holesch wrote:
> Skip submitting URBs, when identical requests were already sent in
> tweak_special_requests(). Instead call the completion handler directly
> to return the result of the URB.
> 
> Even though submitting those requests twice should be harmless, there
> are USB devices that react poorly to some duplicated requests.
> 
> One example is the ChipIdea controller implementation in U-Boot: The
> second SET_CONFIURATION request makes U-Boot disable and re-enable all
> endpoints. Re-enabling an endpoint in the ChipIdea controller, however,
> was broken until U-Boot commit b272c8792502 ("usb: ci: Fix gadget
> reinit").
> 
> Signed-off-by: Simon Holesch <simon@...esch.de>
> ---
> 
> Changes in v3:
> - handle errors in tweak_* routines: send URB if tweaking fails
> 
> Changes in v2:
> - explain change in commit message
> 
> Thanks again for the feedback!

Looks good to me.

Acked-by: Shuah Khan <skhan@...uxfoundation.org>

thanks,
-- Shuah