From: Michael Ellerman <[email protected]> 3.12-stable review patch. If anyone has any objections, please let me know.
=============== commit d319fe2a0af3509f959d5195fb8916accbf14857 upstream. 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 <[email protected]> Signed-off-by: Herbert Xu <[email protected]> Signed-off-by: Jiri Slaby <[email protected]> --- drivers/char/hw_random/pseries-rng.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/char/hw_random/pseries-rng.c b/drivers/char/hw_random/pseries-rng.c index 5f1197929f0c..b761459a3436 100644 --- 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; } -- 2.1.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
