Re: [PATCH 2/3] usb: ucsi_acpi: Fix command completion handling

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Tue, Jan 16, 2024 at 11:40:40PM +0100, Christian A. Ehrhardt wrote:
> In case of a spurious or otherwise delayed notification it is
> possible that CCI still reports the previous completion. The
> UCSI spec is aware of this and provides two completion bits in
> CCI, one for normal commands and one for acks. As acks and commands
> alternate the notification handler can determine if the completion
> bit is from the current command.
> 
> The initial UCSI code correctly handled this but the distinction
> between the two completion bits was lost with the introduction of
> the new API.
> 
> To fix this revive the ACK_PENDING bit for ucsi_acpi and only complete
> commands if the completion bit matches.
> 
> Fixes: f56de278e8ec ("usb: typec: ucsi: acpi: Move to the new API")
> Signed-off-by: Christian A. Ehrhardt <lk@c--e.de>
> ---
> NOTES:
> - I've seen real issues as a result of this.
> - UCSI implementations other than ACPI might need a similar fix.
>   I can give relevant maintainers a heads up once this is properly
>   reviewed and integrated.
> 
>  drivers/usb/typec/ucsi/ucsi_acpi.c | 17 +++++++++++++----
>  1 file changed, 13 insertions(+), 4 deletions(-)

Hi,

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