linux-kernel - [PATCH 1/6] Drivers: hv: vmbus: Properly handle child device remove

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Message-Id: <1424031100-21749-1-git-send-email-kys@microsoft.com>
Date:	Sun, 15 Feb 2015 12:11:35 -0800
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	vkuznets@...hat.com
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 1/6] Drivers: hv: vmbus: Properly handle child device remove

Handle the case when the device may be removed when the device has no driver
attached to it.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 drivers/hv/vmbus_drv.c |   15 +++++++++------
 1 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index da4333b..04bdc0f 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -508,14 +508,17 @@ static int vmbus_probe(struct device *child_device)
  */
 static int vmbus_remove(struct device *child_device)
 {
-	struct hv_driver *drv = drv_to_hv_drv(child_device->driver);
+	struct hv_driver *drv;
 	struct hv_device *dev = device_to_hv_device(child_device);
 
-	if (drv->remove)
-		drv->remove(dev);
-	else
-		pr_err("remove not set for driver %s\n",
-			dev_name(child_device));
+	if (child_device->driver) {
+		drv = drv_to_hv_drv(child_device->driver);
+		if (drv->remove)
+			drv->remove(dev);
+		else
+			pr_err("remove not set for driver %s\n",
+				dev_name(child_device));
+	}
 
 	return 0;
 }
-- 
1.7.4.1

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