[patch 1/2] hw_random: allow rng_dev_read() to return hardware errors.

[Martin Schwidefsky]

From: Ralph Wuerthner <rwuerthn@xxxxxxxxxx>

The api for hardware random number generators is currently limited to
devices that never fail. If the hardware is registered as a source for
random numbers it has to work. This prevents the use of i/o based
random number devices where the i/o might fail.

Add a check for errors after the read from a hardware random number device.

This patch is required to support large random numbers retrieved
from the CEX2C cards on System z.

Signed-off-by: Ralph Wuerthner <rwuerthn@xxxxxxxxxx>
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
---

 drivers/char/hw_random/core.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: quilt-2.6/drivers/char/hw_random/core.c
===================================================================
--- quilt-2.6.orig/drivers/char/hw_random/core.c
+++ quilt-2.6/drivers/char/hw_random/core.c
@@ -116,6 +116,10 @@ static ssize_t rng_dev_read(struct file 
 		err = -EAGAIN;
 		if (!bytes_read && (filp->f_flags & O_NONBLOCK))
 			goto out;
+		if (bytes_read < 0) {
+			err = bytes_read;
+			goto out;
+		}
 
 		err = -EFAULT;
 		while (bytes_read && size) {

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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