staging: hv: fix netvsc sleeping while atomic

The channel callbacks are called directly from vmbus_event_dpc
which runs in tasklet context. These callbacks need to use
GFP_ATOMIC.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=16701

Cc: Hank Janssen <[e-mail]>
Cc: Haiyang Zhang <[e-mail]>
Signed-off-by: Timo Teräs <[e-mail]>
Cc: stable <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/hv/netvsc.c

···
 	/* ASSERT(device); */
 
 	packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
-			 GFP_KERNEL);
+			 GFP_ATOMIC);
 	if (!packet)
 		return;
 	buffer = packet;