linux-kernel - Re: [PATCH v2] usb: host: xhci: Support running urb giveback in tasklet context

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Message-ID: <0529be1d-57d6-18b8-6f62-49f4b3931e1a@linux.intel.com>
Date:   Wed, 8 May 2019 15:04:33 +0300
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Suwan Kim <suwan.kim027@...il.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH v2] usb: host: xhci: Support running urb giveback in
 tasklet context

On 7.5.2019 19.02, Suwan Kim wrote:
> On Mon, Apr 01, 2019 at 11:16:11PM +0900, Suwan Kim wrote:
>> Patch "USB: HCD: support giveback of URB in tasklet context"[1]
>> introduced giveback of urb in tasklet context. [1] This patch was
>> applied to ehci but not xhci. [2] This patch significantly reduces
>> the hard irq time of xhci. Especially for uvc driver, the hard irq
>> including the uvc completion function runs quite long but applying
>> this patch reduces the hard irq time of xhci.
>>
> 
> I sent this patch a month ago but got no answer.
> Is there any feedback for this?
> Please let me know if there are any faults or it needs more tests.
> 

I'll add this to a internal tree first, and let it sit there for a few
weeks, trying to catch possible bugs this change could expose.

-Mathias