ehea: fix might sleep problem

A mutex has to be replaced by spinlocks as it can be called from
a context which does not allow sleeping.
The kzalloc flag GFP_KERNEL has to be replaced by GFP_ATOMIC
for the same reason.

Signed-off-by: Jan-Bernd Themann <themann@de.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/net/ehea/ehea.h b/drivers/net/ehea/ehea.h
index fe872fb..bf57e15 100644
--- a/drivers/net/ehea/ehea.h
+++ b/drivers/net/ehea/ehea.h
@@ -452,7 +452,7 @@
 struct ehea_bcmc_reg_array {
 	struct ehea_bcmc_reg_entry *arr;
 	int num_entries;
-	struct mutex lock;
+	spinlock_t lock;
 };
 
 #define EHEA_PORT_UP 1