[PATCH 53/55] drivers: hv: dxgkrnl: Do not print error messages when virtual GPU is not present

[Eric Curtin]

From: Iouri Tarassov <iourit@xxxxxxxxxxxxxxxxxxx>

Dxgkrnl prints the error message "Failed to acquire global channel lock"
when a process tries to open the /dev/dxg device and there is no
virtual GPU. This message should not be printed in this scenario.

Signed-off-by: Iouri Tarassov <iourit@xxxxxxxxxxxxxxxxxxx>
---
 drivers/hv/dxgkrnl/dxgadapter.c | 2 +-
 drivers/hv/dxgkrnl/dxgmodule.c  | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/hv/dxgkrnl/dxgadapter.c b/drivers/hv/dxgkrnl/dxgadapter.c
index c94283b09fa1..6d3cabb24e6f 100644
--- a/drivers/hv/dxgkrnl/dxgadapter.c
+++ b/drivers/hv/dxgkrnl/dxgadapter.c
@@ -78,12 +78,12 @@ void dxgadapter_start(struct dxgadapter *adapter)
 
 	/* The global channel is initialized when the first adapter starts */
 	if (!dxgglobal->global_channel_initialized) {
+		dxgglobal->global_channel_initialized = true;
 		ret = dxgglobal_init_global_channel();
 		if (ret) {
 			dxgglobal_destroy_global_channel();
 			return;
 		}
-		dxgglobal->global_channel_initialized = true;
 	}
 
 	/* Initialize vGPU vm bus channel */
diff --git a/drivers/hv/dxgkrnl/dxgmodule.c b/drivers/hv/dxgkrnl/dxgmodule.c
index 8f5d6db256a3..c2a4a2a2136f 100644
--- a/drivers/hv/dxgkrnl/dxgmodule.c
+++ b/drivers/hv/dxgkrnl/dxgmodule.c
@@ -46,9 +46,13 @@ int dxgglobal_acquire_channel_lock(void)
 {
 	struct dxgglobal *dxgglobal = dxggbl();
 
+	if (!dxgglobal->global_channel_initialized)
+		return -ENODEV;
+
 	down_read(&dxgglobal->channel_lock);
 	if (dxgglobal->channel.channel == NULL) {
 		DXG_ERR("Failed to acquire global channel lock");
+		up_read(&dxgglobal->channel_lock);
 		return -ENODEV;
 	} else {
 		return 0;