On 2021/5/27 18:04, Jani Nikula wrote:
> On Thu, 27 May 2021, Zhen Lei <thunder.leiz...@huawei.com> wrote:
>> If intel_hdcp_validate_v_prime() has been successful within the allowed
>> number of tries, we can directly call drm_dbg_kms() and "goto out" without
>> jumping out of the loop and repeatedly judging whether the operation is
>> successful. This can help us reduce an unnecessary if judgment. And it's
>> a little clearer to read.
>
> Generally I think the "happy day scenario" should be at the topmost
> indentation level and not buried in the ifs with a goto exit.
for (xxx) {
if (a == b)
return found;
}
At least this way of writing is common.
>
> BR,
> Jani.
>
>>
>> No functional change.
>>
>> Signed-off-by: Zhen Lei <thunder.leiz...@huawei.com>
>> ---
>> drivers/gpu/drm/i915/display/intel_hdcp.c | 24 ++++++++++-------------
>> 1 file changed, 10 insertions(+), 14 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c
>> b/drivers/gpu/drm/i915/display/intel_hdcp.c
>> index d8570e14fe60..c32a854eda66 100644
>> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
>> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
>> @@ -663,13 +663,13 @@ int intel_hdcp_auth_downstream(struct intel_connector
>> *connector)
>>
>> ret = shim->read_ksv_fifo(dig_port, num_downstream, ksv_fifo);
>> if (ret)
>> - goto err;
>> + goto out;
>>
>> if (drm_hdcp_check_ksvs_revoked(&dev_priv->drm, ksv_fifo,
>> num_downstream) > 0) {
>> drm_err(&dev_priv->drm, "Revoked Ksv(s) in ksv_fifo\n");
>> ret = -EPERM;
>> - goto err;
>> + goto out;
>> }
>>
>> /*
>> @@ -680,20 +680,16 @@ int intel_hdcp_auth_downstream(struct intel_connector
>> *connector)
>> ret = intel_hdcp_validate_v_prime(connector, shim,
>> ksv_fifo, num_downstream,
>> bstatus);
>> - if (!ret)
>> - break;
>> - }
>> -
>> - if (i == tries) {
>> - drm_dbg_kms(&dev_priv->drm,
>> - "V Prime validation failed.(%d)\n", ret);
>> - goto err;
>> + if (!ret) {
>> + drm_dbg_kms(&dev_priv->drm,
>> + "HDCP is enabled (%d downstream devices)\n",
>> + num_downstream);
>> + goto out;
>> + }
>> }
>>
>> - drm_dbg_kms(&dev_priv->drm, "HDCP is enabled (%d downstream devices)\n",
>> - num_downstream);
>> - ret = 0;
>> -err:
>> + drm_dbg_kms(&dev_priv->drm, "V Prime validation failed.(%d)\n", ret);
>> +out:
>> kfree(ksv_fifo);
>> return ret;
>> }
>
