linux-kernel - Re: [RFC PATCH] usb: hcd: complete URBs in threaded-IRQ context instead of tasklet

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Message-ID: <20180416140103.33s2xarrxxeecttk@linutronix.de>
Date:   Mon, 16 Apr 2018 16:01:04 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Mauro Carvalho Chehab <mchehab@...pensource.com>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alan Stern <stern@...land.harvard.edu>,
        linux-usb@...r.kernel.org
Subject: Re: [RFC PATCH] usb: hcd: complete URBs in threaded-IRQ context
 instead of tasklet

On 2018-03-08 10:57:39 [+0100], To Mauro Carvalho Chehab wrote:
> On 2018-02-27 14:39:34 [-0300], Mauro Carvalho Chehab wrote:
> > Hi Sebastian,
> Hi Mauro,
> 
> > Sorry for taking some time to test it, has been busy those days...
> :)
> 
> > Anyway, I tested it today. Didn't work. It keep losing data.
> 
> Okay, this was unexpected. What I learned from the thread is that you
> use the dwc2 controller and once upgrade to a kernel which completes the
> URBs in BH context then you starting losing data from your DVB-s USB
> device. And it was assumed that this is because BH/ksoftirq is getting
> "paused" if it is running for too long. If that is the case then a
> revert of "let us complete the URB in BH context" should get it working
> again. Is that so?

ping

Sebastian