Re: dvb usb issues since kernel 4.9

Hi Linus,

Em Tue, 17 Jul 2018 10:09:28 -0700
Linus Torvalds [off-list ref] escreveu:

On Tue, Jul 17, 2018 at 4:58 AM Hanna Hawa [off-list ref] wrote:

quoted

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.

quoted

- 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?

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..

Yeah, IMHO the best would be to apply your patch[1], c/c stable up to
4.9. Nothing prevents applying a better/smarter solution once we
have it. From my side, I can keep testing whatever smart suggestions
people propose. Yet, better to have one fix on our hand than two
fixes flying around.

[1] e. g. 
	https://git.linuxtv.org/mchehab/experimental.git/commit/?h=v4.15%2bmedia%2bdwc2&id=ccf833fd4a5b99c3d3cf2c09c065670f74a230a7

Regards,
Mauro