[PATCH] drm/dp_helper: don't return EPROTO for defers

[Jani Nikula]

On Fri, 04 Apr 2014, Dave Airlie <airlied at gmail.com> wrote:
> From: Dave Airlie <airlied at redhat.com>
>
> If we get a msg.reply of REPLY_DEFER, we also get an err of 0
> so we fail reads with 0 < size and return -EPROTO instead of trying
> again.
>
> Found writing MST support.
>

Reviewed-by: Jani Nikula <jani.nikula at intel.com>


> Signed-off-by: Dave Airlie <airlied at redhat.com>
> ---
>  drivers/gpu/drm/drm_dp_helper.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> index f4babed..725354f 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -386,11 +386,11 @@ static int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request,
>  			return err;
>  		}
>  
> -		if (err < size)
> -			return -EPROTO;
>  
>  		switch (msg.reply & DP_AUX_NATIVE_REPLY_MASK) {
>  		case DP_AUX_NATIVE_REPLY_ACK:
> +			if (err < size)
> +				return -EPROTO;
>  			return err;
>  
>  		case DP_AUX_NATIVE_REPLY_NACK:
> -- 
> 1.8.5.3
>
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-- 
Jani Nikula, Intel Open Source Technology Center