Em Mon, 1 Dec 2014 12:55:09 +0000
James Hogan <james.hogan@xxxxxxxxxx> escreveu:
> When the img-ir driver is asked to change protocol, if the chosen
> decoder is already loaded then don't call img_ir_set_decoder(), so as
> not to clear the current filter.
>
> This is important because store_protocol() does not refresh the scancode
> filter with the new protocol if the set of enabled protocols hasn't
> actually changed, but it will still call the change_protocol() callback,
> resulting in the filter being disabled in the hardware.
>
> The problem can be reproduced by setting a filter, and then setting the
> protocol to the same protocol that is already set:
> $ echo nec > protocols
> $ echo 0xffff > filter_mask
> $ echo nec > protocols
>
> After this, messages which don't match the filter still get received.
This should be fixed at the RC core, as this is not driver-specific.
Regards,
Mauro
>
> Reported-by: Sifan Naeem <sifan.naeem@xxxxxxxxxx>
> Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
> Cc: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx> # v3.15+
> Cc: linux-media@xxxxxxxxxxxxxxx
> ---
> drivers/media/rc/img-ir/img-ir-hw.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/media/rc/img-ir/img-ir-hw.c b/drivers/media/rc/img-ir/img-ir-hw.c
> index 9db065344b41..1566337c1059 100644
> --- a/drivers/media/rc/img-ir/img-ir-hw.c
> +++ b/drivers/media/rc/img-ir/img-ir-hw.c
> @@ -643,6 +643,12 @@ static int img_ir_change_protocol(struct rc_dev *dev, u64 *ir_type)
> continue;
> if (*ir_type & dec->type) {
> *ir_type &= dec->type;
> + /*
> + * We don't want to clear the filter if nothing is
> + * changing as it won't get set again.
> + */
> + if (dec == hw->decoder)
> + return 0;
> img_ir_set_decoder(priv, dec, *ir_type);
> goto success;
> }
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