Re: [PATCH 2/3] ata: libata-core: Quirk DELLBOSS VD MV.R00-0 max_sectors

[Niklas Cassel <cassel@kernel.org>]

On Mon, Nov 24, 2025 at 02:44:17PM +0100, Niklas Cassel wrote:
> DELLBOSS VD MV.R00-0 with FW rev MV.R00-0 times out when sending
> I/Os of size 4096 KiB.
> 
> Add a quirk so that the SATA controller is usable again.
> 
> Fixes: 9b8b84879d4a ("block: Increase BLK_DEF_MAX_SECTORS_CAP")
> Signed-off-by: Niklas Cassel <cassel@kernel.org>
> ---

Jack, it would be helpful if you could test this series.

We know that your hardware chokes on 8192 sectors
(one sector is always 512 bytes in Linux kernel code)
8192 * 512 = 4194304 bytes = 4096 KiB == 4 MiB.


When you write 4095 to max_sectors, we will set the limit to
8190 sectors.

My guess is that your hardware chokes when receiving an I/O
of anything larger than 8191 sectors.

If your hardware still chokes with this patch applied, then
we need to change the quirk to limit the I/Os to 8190 sectors
(which, thanks to your testing, we already know works).


Kind regards,
Niklas