Re: [PATCH 0/5] Fixes for HiSilicon LPC driver and logical PIO code

[Olof Johansson]

Hi John,

For patches that go to a soc maintainer for merge, we're asking that
people don't cc arm@xxxxxxxxxx directly.

We prefer to keep that alias mostly for pull requests from other
maintainers and patches we might have a reason to apply directly.
Otherwise we risk essentially getting all of linux-arm-kernel into
this mailbox as well.


Thanks!

-Olof

On Thu, Jun 20, 2019 at 11:33 AM John Garry <john.garry@xxxxxxxxxx> wrote:
>
> As reported in [1], the hisi-lpc driver has certain issues in handling
> logical PIO regions, specifically unregistering regions.
>
> This series add a method to unregister a logical PIO region, and fixes up
> the driver to use them.
>
> RCU usage in logical PIO code looks to always have been broken, so that
> is fixed also. This is not a major fix as the list which RCU protects is
> very rarely modified.
>
> There is another patch to simplify logical PIO registration, made possible
> by the fixes.
>
> At this point, there are still separate ongoing discussions about how to
> stop the logical PIO and PCI host bridge code leaking ranges, as in [2].
>
> Hopefully this series can go through the arm soc tree and the maintainers
> have no issue with that. I'm talking specifically about the logical PIO
> code, which went through PCI tree on only previous upstreaming.
>
> Cc. linux-pci@xxxxxxxxxxxxxxx
>
> [1] https://lore.kernel.org/lkml/1560770148-57960-1-git-send-email-john.garry@xxxxxxxxxx/
> [2] https://lore.kernel.org/lkml/4b24fd36-e716-7c5e-31cc-13da727802e7@xxxxxxxxxx/
>
> John Garry (5):
>   lib: logic_pio: Fix RCU usage
>   lib: logic_pio: Add logic_pio_unregister_range()
>   bus: hisi_lpc: Unregister logical PIO range to avoid potential
>     use-after-free
>   bus: hisi_lpc: Add .remove method to avoid driver unbind crash
>   lib: logic_pio: Enforce LOGIC_PIO_INDIRECT region ops are set at
>     registration
>
>  drivers/bus/hisi_lpc.c    | 43 ++++++++++++++++++---
>  include/linux/logic_pio.h |  1 +
>  lib/logic_pio.c           | 78 ++++++++++++++++++++++++++++-----------
>  3 files changed, 95 insertions(+), 27 deletions(-)
>
> --
> 2.17.1
>