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

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Date:	Fri, 23 Oct 2009 18:14:24 +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. Remove code that checks for dev_name, the affected structure is kzalloc-ed prior to this routine, so it is always null at this stage.

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..1c7f887 100644
--- a/drivers/staging/hv/vmbus_drv.c
+++ b/drivers/staging/hv/vmbus_drv.c
@@ -537,18 +537,7 @@ static int vmbus_child_device_register(struct hv_device *root_device_obj,
 	DPRINT_DBG(VMBUS_DRV, "child device (%p) registering",
 		   child_device_ctx);
 
-	/* Make sure we are not registered already */
-	if (strlen(dev_name(&child_device_ctx->device)) != 0) {
-		DPRINT_ERR(VMBUS_DRV,
-			   "child device (%p) already registered - busid %s",
-			   child_device_ctx,
-			   dev_name(&child_device_ctx->device));
-
-		ret = -1;
-		goto Cleanup;
-	}
-
-	/* Set the device bus id. Otherwise, device_register()will fail. */
+	/* Set the device name. Otherwise, device_register()will fail. */
 	dev_set_name(&child_device_ctx->device, "vmbus_0_%d",
 		     atomic_inc_return(&device_num));
 
@@ -573,7 +562,6 @@ static int vmbus_child_device_register(struct hv_device *root_device_obj,
 		DPRINT_INFO(VMBUS_DRV, "child device (%p) registered",
 			    &child_device_ctx->device);
 
-Cleanup:
 	DPRINT_EXIT(VMBUS_DRV);
 
 	return ret;
--
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