Re: [stable-4.19 1/2] scsi: pm80xx: panic on ncq error cleaning up the read log.

[Greg KH <gregkh@linuxfoundation.org>]

On Mon, Mar 09, 2020 at 11:17:38AM +0100, Jack Wang wrote:
> From: Viswas G <Viswas.G@microsemi.com>
> 
> commit 0b6df110b3d0c12562011fcd032cfb6ff16b6d56 upstream
> 
> when there's an error in 'ncq mode' the host has to read the ncq error
> log (10h) to clear the error state. however, the ccb that is setup for
> doing this doesn't setup the ccb so that the previous state is
> cleared. if the ccb was previously used for an IO n_elems is set and
> pm8001_ccb_task_free() treats this as the signal to go free a
> scatter-gather list (that's already been freed).
> 
> Signed-off-by: Deepak Ukey <deepak.ukey@microsemi.com>
> Signed-off-by: Viswas G <Viswas.G@microsemi.com>
> Acked-by: Jack Wang <jinpu.wang@profitbricks.com>
> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
> ---
>  drivers/scsi/pm8001/pm80xx_hwi.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)

This commit showed up in 4.15, how can it also go into 4.19 again?

Totally confused,

greg k-h