Am 13.10.2016 10:55, schrieb Dan Carpenter:
> We want to read 3 bytes here, but because the parenthesis are in the
> wrong place we instead read:
>
> sizeof(intel_dp->edp_dpcd) == sizeof(intel_dp->edp_dpcd)
>
> which is one byte.
>
> Fixes: fe5a66f91c88 ("drm/i915: Read PSR caps/intermediate freqs/etc. only once on eDP")
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 14a3cf0..ee8aa95 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -3551,8 +3551,8 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp)
> /* Read the eDP Display control capabilities registers */
> if ((intel_dp->dpcd[DP_EDP_CONFIGURATION_CAP] & DP_DPCD_DISPLAY_CONTROL_CAPABLE) &&
> drm_dp_dpcd_read(&intel_dp->aux, DP_EDP_DPCD_REV,
> - intel_dp->edp_dpcd, sizeof(intel_dp->edp_dpcd) ==
> - sizeof(intel_dp->edp_dpcd)))
> + intel_dp->edp_dpcd, sizeof(intel_dp->edp_dpcd)) ==
> + sizeof(intel_dp->edp_dpcd))
perhaps we can morph that into something more readable ? I would suggest:
if (intel_dp->dpcd[DP_EDP_CONFIGURATION_CAP] & DP_DPCD_DISPLAY_CONTROL_CAPABLE)
{
size_t size=sizeof(intel_dp->edp_dpcd); /* == EDP_DISPLAY_CTL_CAP_SIZE */
int ret;
ret=drm_dp_dpcd_read(&intel_dp->aux, DP_EDP_DPCD_REV,intel_dp->edp_dpcd,size);
if (ret != size )
......
}
this way it improves readability and reduces line length.
> DRM_DEBUG_KMS("EDP DPCD : %*ph\n", (int) sizeof(intel_dp->edp_dpcd),
> intel_dp->edp_dpcd);
>
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