Merge remote-tracking branch 'hid/for-next'

[karo-tx-linux.git] / drivers / char / hw_random / pseries-rng.c

diff --git a/drivers/char/hw_random/pseries-rng.c b/drivers/char/hw_random/pseries-rng.c
index 5f1197929f0ceebaa2ca34632ca16be9046150dc..b761459a3436c25d31321f5bb46037f7faaf9292 100644 (file)
--- a/drivers/char/hw_random/pseries-rng.c
+++ b/drivers/char/hw_random/pseries-rng.c
@@ -17,6 +17,9 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/hw_random.h>
 #include <asm/vio.h>
@@ -25,10 +28,15 @@
 
 static int pseries_rng_data_read(struct hwrng *rng, u32 *data)
 {
-       if (plpar_hcall(H_RANDOM, (unsigned long *)data) != H_SUCCESS) {
-               printk(KERN_ERR "pseries rng hcall error\n");
-               return 0;
+       int rc;
+
+       rc = plpar_hcall(H_RANDOM, (unsigned long *)data);
+       if (rc != H_SUCCESS) {
+               pr_err_ratelimited("H_RANDOM call failed %d\n", rc);
+               return -EIO;
        }
+
+       /* The hypervisor interface returns 64 bits */
        return 8;
 }