Drivers: hv: fcopy: set .owner reference for file operations

Get an additional reference otherwise a crash is observed when hv_utils module is being unloaded while
fcopy daemon is still running. .owner gives us an additional reference when
someone holds a descriptor for the device.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Tested-by: Alex Ng <alexng@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hv/hv_fcopy.c b/drivers/hv/hv_fcopy.c
index a501301..d1475e6 100644 (file)
--- a/drivers/hv/hv_fcopy.c
+++ b/drivers/hv/hv_fcopy.c
@@ -360,12 +360,9 @@ static int fcopy_open(struct inode *inode, struct file *f)
 }
 
 /* XXX: there are still some tricky corner cases, e.g.,
- * 1) In a SMP guest, when fcopy_release() runs between
+ * In an SMP guest, when fcopy_release() runs between
  * schedule_delayed_work() and fcopy_send_data(), there is
  * still a chance an obsolete message will be queued.
- *
- * 2) When the fcopy daemon is running, if we unload the driver,
- * we'll notice a kernel oops when we kill the daemon later.
  */
 static int fcopy_release(struct inode *inode, struct file *f)
 {
@@ -385,6 +382,7 @@ static int fcopy_release(struct inode *inode, struct file *f)
 
 
 static const struct file_operations fcopy_fops = {
+       .owner          = THIS_MODULE,
        .read           = fcopy_read,
        .write          = fcopy_write,
        .release        = fcopy_release,