linux-kernel - Re: [PATCH v5 1/5] usb: dwc3: Avoid unmapping USB requests if endxfer is not complete

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Date:   Thu, 1 Sep 2022 12:10:27 -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 v5 1/5] usb: dwc3: Avoid unmapping USB requests if endxfer
 is not complete

On 9/1/2022 7:10 AM, Greg KH wrote:
> On Wed, Aug 31, 2022 at 11:32:38AM -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(-)
> 
> As the kernel-test robot reported, this patch doesn't even build.  How
> did you test it?
> 
Sorry Greg, didn't get a chance to test it before submitting, but fixed 
the build errors in v6.  I had initially missed the argument changes to 
the APIs.

V6 works as expected.

Thanks
Wesley Cheng