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Subject: Re: dvb usb issues since kernel 4.9
To:     Linus Torvalds <torvalds@linux-foundation.org>
References: <CA+55aFwuAojr7vAfiRO-2je-wDs7pu+avQZNhX_k9NN=D7_zVQ@mail.gmail.com>
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CC:     Jonathan Corbet <corbet@lwn.net>,
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        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Josef Griebichler <griebichler.josef@gmx.at>,
        Hannes Frederic Sowa <hannes@redhat.com>,
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        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
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        "Mauro Carvalho Chehab" <mchehab@s-opensource.com>,
        Ingo Molnar <mingo@kernel.org>,
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        Paolo Abeni <pabeni@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
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        Alan Stern <stern@rowland.harvard.edu>,
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        Dan Williams <dan.j.williams@intel.com>, <nadavh@marvell.com>,
        <thomas.petazzoni@bootlin.com>, <omrii@marvell.com>
From:   Hanna Hawa <hannah@marvell.com>
Message-ID: <361dec80-081e-c796-2052-71d006b84ffc@marvell.com>
Date:   Tue, 17 Jul 2018 21:07:36 +0300
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Hi Linus,

On 07/17/2018 08:09 PM, Linus Torvalds wrote:
> On Tue, Jul 17, 2018 at 4:58 AM Hanna Hawa <hannah@marvell.com> wrote:
>>
>> After some debug/bisect/diff, found that patch "softirq: Let ksoftirqd
>> do its job" is problematic patch.
>
> Ok, this thread died down without any resolution.
>
>> - Using v4.14.0 (including softirq patch) and the additional fix
>> proposed by Linus - no timeout issue.
>
> Are you talking about the patch that made HI_SOFTIRQ and
> TASKLET_SOFTIRQ special, and had this:
>
>   #define SOFTIRQ_NOW_MASK ((1 << HI_SOFTIRQ) | (1 << TASKLET_SOFTIRQ))
>
> in it?
yes, exactly..

Link to the patch:
https://git.linuxtv.org/mchehab/experimental.git/commit/?h=v4.15%2bmedia%2bdwc2&id=ccf833fd4a5b99c3d3cf2c09c065670f74a230a7

Thanks,
Hanna

>
> I think I'll just commit the damn thing. It's hacky, but it's simple,
> and it never got applied because we had smarter suggestions. But the
> smarter suggestions never ended up being applied either, so..
>
>                        Linus
>