linux-kernel - Re: [PATCH v4 5/9] usb: dwc3: Avoid unmapping USB requests if endxfer is not complete

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Date:   Tue, 30 Aug 2022 11:13:59 -0700
From:   Wesley Cheng <quic_wcheng@...cinc.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     <balbi@...nel.org>, <Thinh.Nguyen@...opsys.com>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <quic_jackp@...cinc.com>
Subject: Re: [PATCH v4 5/9] usb: dwc3: Avoid unmapping USB requests if endxfer
 is not complete

Hi Greg,

On 8/30/2022 7:08 AM, Greg KH wrote:
> On Wed, Aug 17, 2022 at 11:23:55AM -0700, Wesley Cheng wrote:
>> If DWC3_EP_DELAYED_STOP is set during stop active transfers, then do not
>> continue attempting to unmap request buffers during dwc3_remove_requests().
>> This can lead to SMMU faults, as the controller has not stopped the
>> processing of the TRB.  Defer this sequence to the EP0 out start, which
>> ensures that there are no pending SETUP transactions before issuing the
>> endxfer.
>>
>> Reviewed-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
>> Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
>> ---
>>   drivers/usb/dwc3/core.h   | 3 +++
>>   drivers/usb/dwc3/ep0.c    | 5 ++++-
>>   drivers/usb/dwc3/gadget.c | 6 +++++-
>>   3 files changed, 12 insertions(+), 2 deletions(-)
>>
> 
> This commit does not apply to my usb-testing branch.  I've taken the
> first 4, please rebase and resend the rest.
> 

Sure resubmit it later today.  Sorry about that and thanks for the heads up.

Thanks
Wesley Cheng