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

[Kurt Kanzenbach <kurt@linutronix.de>]

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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@linuxfoundation.org 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@baidu.com>
>> > Cc: Kurt Kanzenbach <kurt@linutronix.de>
>> > Cc: Vikram Pandita <vikram.pandita@ti.com>
>> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
>> > Cc: stable <stable@vger.kernel.org>
>> > Acked-by: Kurt Kanzenbach <kurt@linutronix.de>
>> > Link: https://lore.kernel.org/r/20200211135559.85960-1-andriy.shevchenko@linux.intel.com
>> > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>> 
>> 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.

Thanks,
Kurt

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