Re: FAILED: patch "[PATCH] serial: 8250: Check UPF_IRQ_SHARED in advance" failed to apply to 4.14-stable tree

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On Fri, Feb 28, 2020 at 09:47:16AM +0100, Kurt Kanzenbach wrote:
Hi,

On Thu Feb 27 2020, Andy Shevchenko wrote:
On Wed, Feb 26, 2020 at 06:39:49PM -0500, Sasha Levin wrote:
On Wed, Feb 26, 2020 at 11:36:04AM +0100, gregkh@xxxxxxxxxxxxxxxxxxx wrote:

...

> Since this change we don't need to have custom solutions in 8250_aspeed_vuart
> and 8250_of drivers, thus, drop them.
>
> Fixes: 1c2f04937b3e ("serial: 8250: add IRQ trigger support")
> Reported-by: Li RongQing <lirongqing@xxxxxxxxx>
> Cc: Kurt Kanzenbach <kurt@xxxxxxxxxxxxx>
> Cc: Vikram Pandita <vikram.pandita@xxxxxx>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> Cc: stable <stable@xxxxxxxxxxxxxxx>
> Acked-by: Kurt Kanzenbach <kurt@xxxxxxxxxxxxx>
> Link: https://lore.kernel.org/r/20200211135559.85960-1-andriy.shevchenko@xxxxxxxxxxxxxxx
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

For 4.14, I've worked around these missing commits:

5909c0bf9c7a ("serial/aspeed-vuart: Implement quick throttle mechanism")
989983ea849d ("serial/aspeed-vuart: Implement rx throttling")
54e53b2e8081 ("tty: serial: 8250: pass IRQ shared flag to UART ports")

Thanks!

And queued up a backport. Older kernels are a bit trickier than that.

Thanks for backporting. Why is it trickier?


Since it's quite old bug and not many reports so far I guess we are not in
hurry to fix that old kernels.

It would be quite nice to have that in v4.9 as well. My original patch
was made against that tree and tested.

Hm, yes, looking at it now it doesn't look too tricky, I'm not sure what
happened a few days ago :)

If you want to send me a backport I'll be happy to queue it up.

--
Thanks,
Sasha



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