Re: FAILED: patch "[PATCH] tty: serial: fsl_lpuart: LS1021A has a FIFO size of 16 words," failed to apply to 5.4-stable tree

["gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>]

On Tue, Nov 03, 2020 at 10:48:26PM +0000, Vladimir Oltean wrote:
> On Tue, Nov 03, 2020 at 03:23:20PM +0100, gregkh@linuxfoundation.org wrote:
> > The patch below does not apply to the 5.4-stable tree.
> > If someone wants it applied there, or to any other stable or longterm
> > tree, then please email the backport, including the original git commit
> > id to <stable@vger.kernel.org>.
> 
> Greg,
> 
> For linux-5.4.y, could you please do the following so that I don't need
> to explicitly resend these to linux-stable?
> 
> # tty: serial: fsl_lpuart: add LS1028A support
> git cherry-pick -xs c2f448cff22a7ed09281f02bde084b0ce3bc61ed # this is dependency
> # tty: serial: fsl_lpuart: LS1021A has a FIFO size of 16 words, like LS1028A
> git cherry-pick -xs c97f2a6fb3dfbfbbc88edc8ea62ef2b944e18849 # this is the one that failed
> 
> Both sha1sums can be found in Linus' tree.
> 
> I have tested these 2 cherry-picks on top of linux-5.4.y on my board,
> and it works just fine.
> 
> I was a bit concerned about backporting the LS1028A patch as a
> dependency for my fix, but I have consulted
> Documentation/process/stable-kernel-rules.rst and it says:
> 
>  - New device IDs and quirks are also accepted.
> 
> That patch also satisfies the following:
> 
>  - It must be obviously correct and tested. <- check
>  - It cannot be bigger than 100 lines, with context. <- check
> 
> The patch does not apply because the fixes were discovered backwards.
> LS1021A and LS1028A should be compatible with one another. However
> when bringing up the LS1028A, Michael found the LPUART to be broken,
> thought the LS1021A was working, and added the FIFO size quirk as a
> LS1028A 'feature'.

That worked, now done, thanks.

greg k-h