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

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Message-ID: <20190508144016.GA2569@localhost.localdomain>
Date:   Wed, 8 May 2019 23:40:18 +0900
From:   Suwan Kim <suwan.kim027@...il.com>
To:     Mathias Nyman <mathias.nyman@...ux.intel.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 Wed, May 08, 2019 at 03:04:33PM +0300, Mathias Nyman wrote:
> 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.

Thank you for spending your time for it! I also have been testing it
in my daily desktop and until now, there are no special issues.
If some bugs occur, i will report it to the mailing list.

Regards

Suwan Kim