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hwrng: Return errors to upper levels in pseries-rng.c

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We don't expect to get errors from the hypervisor when reading the rng,
but if we do we should pass the error up to the hwrng driver. Otherwise
the hwrng driver will continue calling us forever.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman 2013-09-25 19:24:17 +10:00 committed by Benjamin Herrenschmidt
parent 41b93b238a
commit f95dabef4c
1 changed files with 11 additions and 3 deletions
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14
drivers/char/hw_random/pseries-rng.c
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@ -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;
}