From: Peter Zu <pzu@nvidia.com>
Date: Thu, 7 Apr 2011 04:42:33 +0000 (-0700)
Subject: video: tegra: dc: hdcp: handle the case of DEVICE_COUNT = 0 properly
X-Git-Tag: firefly_0821_release~9833^2~13^2~1
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=780073d7c4c001f78a5b3cd2d464ddd2f15c44e0;p=firefly-linux-kernel-4.4.55.git

video: tegra: dc: hdcp: handle the case of DEVICE_COUNT = 0 properly

When HDCP repeater has no device attached, DEVICE_COUNT reports back as 0.
HDCP driver should handle this case as a good case and continue downstream
authentication, other than fail it.

Change-Id: Ied2e46428c0247f14fbd96016cd4fdbf358f6587
---

diff --git a/drivers/video/tegra/dc/nvhdcp.c b/drivers/video/tegra/dc/nvhdcp.c
index 7c8869a563f5..5c2d9050a14b 100644
--- a/drivers/video/tegra/dc/nvhdcp.c
+++ b/drivers/video/tegra/dc/nvhdcp.c
@@ -354,6 +354,9 @@ static int get_ksvfifo(struct tegra_nvhdcp *nvhdcp,
 	if (!ksv_list || num_bksv_list > TEGRA_NVHDCP_MAX_DEVS)
 		return -EINVAL;
 
+	if (num_bksv_list == 0)
+		return 0;
+
 	buf = kmalloc(buf_len, GFP_KERNEL);
 	if (IS_ERR_OR_NULL(buf))
 		return -ENOMEM;