linux-kernel - [PATCH] Staging: hv: Fix null pointer error after vmbus loading

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Message-ID: <1FB5E1D5CA062146B38059374562DF72180B3E1E@TK5EX14MBXC126.redmond.corp.microsoft.com>
Date:	Thu, 22 Oct 2009 16:14:31 +0000
From:	Haiyang Zhang <haiyangz@...rosoft.com>
To:	"gregkh@...e.de" <gregkh@...e.de>,
	Hank Janssen <hjanssen@...rosoft.com>
CC:	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>
Subject: [PATCH] Staging: hv: Fix null pointer error after vmbus loading

From: Haiyang Zhang <haiyangz@...rosoft.com>

Fix null pointer error after vmbus loading.

Cc: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Hank Janssen <hjanssen@...rosoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>

---
diff --git a/drivers/staging/hv/vmbus_drv.c b/drivers/staging/hv/vmbus_drv.c
index 582318f..11431cc 100644
--- a/drivers/staging/hv/vmbus_drv.c
+++ b/drivers/staging/hv/vmbus_drv.c
@@ -538,9 +538,10 @@ static int vmbus_child_device_register(struct hv_device *root_device_obj,
 		   child_device_ctx);
 
 	/* Make sure we are not registered already */
-	if (strlen(dev_name(&child_device_ctx->device)) != 0) {
+	if (dev_name(&child_device_ctx->device) != NULL &&
+	    strlen(dev_name(&child_device_ctx->device)) != 0) {
 		DPRINT_ERR(VMBUS_DRV,
-			   "child device (%p) already registered - busid %s",
+			   "child device (%p) already registered - device name: %s",
 			   child_device_ctx,
 			   dev_name(&child_device_ctx->device));

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